Updated on 2026/02/20

写真a

 
Nawachi Shoichi
 
Organization
Faculty of Medicine, Dentistry and Pharmaceutical Sciences Special-Appointment Assistant Professor
Position
Special-Appointment Assistant Professor
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Research Interests

  • Autoimmune disease

  • Immunology

Research History

  • 岡山大学学術研究院 医歯薬学域   助教

    2025.4

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  • 岡山大学大学院 医師薬学総合研究科   大学院生

    2020.4

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  • 岡山大学病院   医師

    2020.4 - 2025.3

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  • 姫路赤十字病院   修練医

    2017.4 - 2020.3

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  • 臨床研修部

    2015.4 - 2017.3

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Professional Memberships

 

Papers

  • Dental infection is associated with early relapse in patients with ANCA-associated vasculitis. International journal

    Shoichi Nawachi, Takayuki Katsuyama, Yoshia Miyawaki, Moe Sakamoto-Tokunaga, Natsuki Kubota, Yuya Terajima, Kazuya Matsumoto, Kei Hirose, Takato Nakadoi, Manami Hirata-Watanabe, Yu Katayama, Keigo Hayashi, Haruki Watanabe, Eri Katsuyama, Mariko Takano-Narazaki, Shigetomo Tsuji, Yoshinori Matsumoto, Ken-Ei Sada, Jun Wada

    RMD open   12 ( 1 )   2026.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    OBJECTIVES: Anti-neutrophil cytoplasmic antibody-associated vasculitis (AAV) is a systemic autoimmune disease where infections can trigger relapses. Dental infections, being common and associated with systemic inflammation, may play a role in AAV relapse, though their impact remains unclear. We aimed to evaluate the association between severe dental infections and early relapse in patients with AAV. METHODS: This retrospective cohort study included patients newly diagnosed with AAV between January 2011 and July 2022. Patients with severe dental infections requiring tooth extraction were placed in the dental infection group, while the remaining patients were assigned to the control group. The primary outcome was defined as either vasculitis relapse or all-cause mortality within 1 year of treatment initiation. Adjusted HRs (aHRs) and 95% CIs were estimated using Cox proportional hazards models. RESULTS: A total of 93 patients were enrolled with a median age of 74 years. 41 patients (44.1%) had severe dental infections in this cohort. Over the 1-year follow-up period, 13 patients experienced a relapse and two died, resulting in a composite event rate of 20.9 per 100 person-years. Dental infection was independently associated with the composite outcome (aHR, 3.78 (95% CI 1.13 to 12.66); p=0.031). Exploratory analysis indicated that composite outcome rates were similar regardless of tooth extraction among patients with dental infections. CONCLUSIONS: Severe dental infections were associated with increased risk of early relapse or mortality in AAV. These findings highlight the importance of early dental evaluation in AAV management.

    DOI: 10.1136/rmdopen-2025-006392

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  • Association of anti-citrullinated protein antibodies with changes in bone density in patients with rheumatoid arthritis treated with romosozumab for one year: A cohort study. International journal

    Yuya Terajima, Yoshia Miyawaki, Koji Takasugi, Ryozo Harada, Wataru Yamamoto, Kazuhiko Ezawa, Natsuki Kubota, Kazuya Matsumoto, Kenta Shidahara, Kei Hirose, Takato Nakadoi, Shoichi Nawachi, Yosuke Asano, Yu Katayama, Eri Katsuyama, Takayuki Katsuyama, Mariko Takano-Narazaki, Yoshinori Matsumoto, Jun Wada

    Modern rheumatology   35 ( 6 )   1079 - 1081   2025.10

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    DOI: 10.1093/mr/roaf051

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  • Dyspnea with Hemidiaphragm Elevation in a Patient with Giant Cell Arteritis.

    Yosuke Asano, Yoshinori Matsumoto, Natsuki Kubota, Yuya Terajima, Kazuya Matsumoto, Kenta Shidahara, Kei Hirose, Takato Nakadoi, Shoichi Nawachi, Yu Katayama, Yoshia Miyawaki, Eri Katsuyama, Takayuki Katsuyama, Mariko Takano-Narazaki, Ken-Ei Sada, Jun Wada

    Internal medicine (Tokyo, Japan)   64 ( 14 )   2245 - 2248   2025.7

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    We herein report the first case of dyspnea with hemidiaphragm elevation in a 68-year-old woman with active giant cell arteritis (GCA), including successful treatment. Contrast-enhanced computed tomography showed a reduced density of the left ophthalmic artery and the left superficial temporal artery with increased soft tissue compared to the other side, indicating that the GCA had flared up and suggesting that the hemidiaphragm elevation might be caused by vasculitis-associated ischemia of the right phrenic nerve. Hemidiaphragm paralysis due to vasculitis-associated ischemia in patients with GCA needs to be distinguished from local infection, tumors, and hepatomegaly, which are the major causes of hemidiaphragm elevation.

    DOI: 10.2169/internalmedicine.4055-24

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  • Pericardial artery lymphoma in a patient with dermatomyositis: A case report. International journal

    Kei Hirose, Takayuki Katsuyama, Natsuki Kubota, Yuya Terajima, Kazuya Matsumoto, Kenta Shidahara, Takato Nakadoi, Shoichi Nawachi, Yu Katayama, Yoshia Miyawaki, Eri Katsuyama, Mariko Narazaki-Takano, Yoshinori Matsumoto, Noboru Asada, Ken-Ei Sada, Jun Wada

    Modern rheumatology case reports   9 ( 1 )   100 - 103   2025.1

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    A woman in her 60s presented with erythema on both elbows, dyspnea on exertion, discomfort, and swelling of the left upper extremity, followed by swelling and myalgia of the right upper and lower extremities. She was diagnosed with anti-transcriptional intermediary factor 1-γ antibody-positive dermatomyositis with interstitial pneumonia. The initial screening tests for malignant diseases including contrast-enhanced computed tomography, upper and lower endoscopy, and gynecological examination did not reveal any obvious abnormalities. The patient experienced two recurrent episodes of muscle weakness and dysphagia during treatment with intravenous glucocorticoids and cyclophosphamide. Five months after diagnosis, a bone marrow biopsy and positron emission tomography-computed tomography scan revealed a coronary malignant lymphoma with suspected systemic metastasis. Although chemotherapy was initiated, the patient ultimately succumbed to alveolar haemorrhage. Coronary lymphoma is very rare and there has been no report of cases associated with myositis. Positron emission tomography-computed tomography may be useful for searching malignancy in anti-transcriptional intermediary factor 1-γ antibody-positive dermatomyositis cases of recurrent relapse.

    DOI: 10.1093/mrcr/rxae065

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  • Association between discontinuity of care and patient trust in the usual rheumatologist among patients with systemic lupus erythematosus: a cross-sectional study. International journal

    Yu Katayama, Yoshia Miyawaki, Kenta Shidahara, Shoichi Nawachi, Yosuke Asano, Eri Katsuyama, Takayuki Katsuyama, Mariko Takano-Narazaki, Yoshinori Matsumoto, Nao Oguro, Nobuyuki Yajima, Yuichi Ishikawa, Natsuki Sakurai, Chiharu Hidekawa, Ryusuke Yoshimi, Shigeru Ohno, Takanori Ichikawa, Dai Kishida, Yasuhiro Shimojima, Ken-Ei Sada, Jun Wada, David H Thom, Noriaki Kurita

    Arthritis research & therapy   26 ( 1 )   195 - 195   2024.11

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    BACKGROUND: Patient trust plays a central role in the patient-physician relationship. This study aimed to determine whether the number of outpatient visits with a covering rheumatologist is associated with patient trust in their usual rheumatologist. METHODS: Japanese adults with systemic lupus erythematosus (SLE) who met the 1997 revised classification criteria of the American College of Rheumatology and had outpatient visits with a covering rheumatologist in the past year were included. We used the 11-item Japanese version of the modified Trust in Physician Scale (range 0-100) to assess patient trust. A general linear model with cluster-robust variance estimation was used to evaluate the association between the number of outpatient visits with covering rheumatologists and the patient's trust in their usual rheumatologist. RESULTS: Of the 515 enrolled participants, 421 patients with SLE were included in our analyses. Patients were divided into groups according to the number of outpatient visits with a covering rheumatologist in the past year as follows: no visits (59.9%; reference group), one to three visits (24.2%; low-frequency group), and four or more visits (15.9%; high-frequency group). The median Trust in Physician Scale score was 81.8 (interquartile range: 72.7-93.2). Both the low-frequency group (mean difference: -3.03; 95% confidence interval [CI] -5.93 to -0.80) and high-frequency group (mean difference: -4.17; 95% CI -7.77 to -0.58) exhibited lower trust in their usual rheumatologist. CONCLUSION: This study revealed that the number of outpatient visits with a covering rheumatologist was associated with lower trust in a patient's usual rheumatologist.

    DOI: 10.1186/s13075-024-03428-0

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  • Immunosuppressive Treatment for an anti-U1 Ribonucleoprotein Antibody-positive Patient with Pulmonary Arterial Hypertension.

    Kazuya Matsumoto, Yoshia Miyawaki, Takayuki Katsuyama, Takato Nakadoi, Kenta Shidahara, Kei Hirose, Shoichi Nawachi, Yosuke Asano, Yu Katayama, Eri Katsuyama, Mariko Takano-Narazaki, Yoshinori Matsumoto, Atsushi Mori, Satoshi Akagi, Ken-Ei Sada, Jun Wada

    Internal medicine (Tokyo, Japan)   63 ( 5 )   671 - 676   2024.3

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    A 34-year-old woman with pulmonary arterial hypertension (PAH) was admitted to the hospital. She had been diagnosed with PAH three years earlier and treated with triple vasodilator therapy. She was positive for anti-U1 ribonucleoprotein antibodies but did not show any other symptoms associated with autoimmune diseases. Corticosteroid and cyclophosphamide therapy was administered, suspecting the involvement of immunological pathophysiology. After 3 weeks, the mean pulmonary artery pressure decreased from 50 to 38 mmHg without any change in the vasodilators. Immunosuppressive therapy was effective in this patient with PAH with an anti-U1 ribonucleoprotein-antibody-positive response and might be an option for patients with these specific features.

    DOI: 10.2169/internalmedicine.1407-22

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  • The first presentation of a case of nail-patella syndrome newly diagnosed at the onset of rheumatoid arthritis: a case report. International journal

    Kazuya Matsumoto, Yoshinori Matsumoto, Shoichi Nawachi, Yosuke Asano, Yu Katayama, Yoshia Miyawaki, Takayuki Katsuyama, Eri Katsuyama, Yoshihisa Nasu, Ken-Ei Sada, Jun Wada

    BMC musculoskeletal disorders   25 ( 1 )   139 - 139   2024.2

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    BACKGROUND: Nail-patella syndrome (NPS) is a rare autosomal dominant disorder that is characterized by dysplasia of the nails, hypoplasia and/or dislocation of the patella and the presence of iliac horns. Using the CARE guidelines, we present the first reported case of NPS that was newly diagnosed at the onset of rheumatoid arthritis (RA). CASE PRESENTATION: A 74-year-old man was admitted to our hospital due to an 8-month history of arthralgia in bilateral wrists, elbows and fingers. He had a past history of glaucoma and left patella dislocation that had been operatively recentered at the age of 15 years. Laboratory data showed elevated levels of serum C-reactive protein and rheumatoid factor and an elevated titer of anti-SS-A antibodies, while estimated glomerular filtration rate (eGFR), titers of other antibodies and the results of a urinary test were normal. An X-ray showed deformity of bilateral radial heads and the right elbow, and magnetic resonance imaging (MRI) of his hands showed synovitis and erosion in the multiple swollen joints of the wrists and fingers. In addition to these typical features of RA, he had bilateral thumb nail dysplasia with mild hypoplasia of bilateral patellae and iliac horns as shown by the X-ray. He was diagnosed as having autosomal dominant disorder NPS co-existing with RA and he was treated with methotrexate in combination with an oral Janus kinase (JAK) inhibitor, leading to induction of remission. CONCLUSIONS: We have presented a rare case of NPS that was newly diagnosed at the onset of RA. Clinical and radiographic findings of NPS are highlighted in this case report for diagnosing NPS on the basis of typical manifestations.

    DOI: 10.1186/s12891-024-07242-2

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  • Infliximab biosimilar-induced lupus nephritis: A case report. International journal

    Kenta Shidahara, Takayuki Katsuyama, Kei Hirose, Kazuya Matsumoto, Shoichi Nawachi, Takato Nakadoi, Yosuke Asano, Yu Katayama, Yoshia Miyawaki, Eri Katsuyama, Mariko Takano-Narazaki, Yoshinori Matsumoto, Ken-Ei Sada, Jun Wada

    Modern rheumatology case reports   8 ( 1 )   74 - 76   2023.12

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    We present a case of microhematuria, proteinuria and hypocomplementemia which developed in a 55-year-old female who was being treated with an infliximab biosimilar for rheumatoid arthritis. Renal biopsy showed lupus nephritis (ISN/RPS classification class IV + V). Treatment with the infliximab biosimilar was discontinued, and treatment with prednisolone, hydroxychloroquine and abatacept was started, resulting in clinical remission of lupus nephritis and RA. Although tumour necrosis factor-α α inhibitors are known to induce production of autoantibodies, symptoms are usually limited to skin involvement or arthritis, and renal complications are rare. Physicians should be aware of the risk of lupus nephritis and carefully monitor patients for the development of renal involvement during treatment with tumour necrosis factor-α inhibitors.

    DOI: 10.1093/mrcr/rxad061

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  • The Association of Grit With Burnout Components (Professional Efficacy, Exhaustion, and Cynicism) Among Academic Rheumatologists: The TRUMP 2 -SLE Study. International journal

    Yoshia Miyawaki, Ken-Ei Sada, Kenta Shidahara, Shoichi Nawachi, Yosuke Asano, Yu Katayama, Keigo Hayashi, Eri Katsuyama, Takayuki Katsuyama, Mariko Takano-Narazaki, Yoshinori Matsumoto, Nao Oguro, Nobuyuki Yajima, Yuichi Ishikawa, Natsuki Sakurai, Chiharu Hidekawa, Ryusuke Yoshimi, Takanori Ichikawa, Dai Kishida, Yasuhiro Shimojima, Jun Wada, Noriaki Kurita

    Journal of clinical rheumatology : practical reports on rheumatic & musculoskeletal diseases   29 ( 6 )   268 - 274   2023.9

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    OBJECTIVES: There is a high prevalence of burnout among rheumatologists. Grit, which is defined as possessing perseverance and a passion to achieve long-term goals, is predictive of success in many professions; however, whether grit is associated with burnout remains unclear, especially among academic rheumatologists, who have multiple simultaneous responsibilities. Thus, the purpose of this study was to examine the associations between grit and self-reported burnout components-professional efficacy, exhaustion, and cynicism-in academic rheumatologists. METHODS: This cross-sectional study involved 51 rheumatologists from 5 university hospitals. The exposure was grit, measured using mean scores for the 8-item Short Grit Scale (range, 1-5 [5 = extremely high grit]). The outcome measures were mean scores for 3 burnout domains (exhaustion, professional efficacy, and cynicism; range, 1-6; measured using the 16-item Maslach Burnout Inventory-General Survey). General linear models were fitted with covariates (age, sex, job title [assistant professor or higher vs lower], marital status, and having children). RESULTS: Overall, 51 physicians (median age, 45 years; interquartile range, 36-57; 76% men) were included. Burnout positivity was found in 68.6% of participants (n = 35/51; 95% confidence interval [CI], 54.1, 80.9). Higher grit was associated with higher professional efficacy (per 1-point increase; 0.51 point; 95% CI, 0.18, 0.84) but not with exhaustion or cynicism. Being male and having children were associated with lower exhaustion (-0.69; 95% CI, -1.28, -0.10; p = 0.02; and -0.85; 95% CI, -1.46, -0.24; p = 0.006). Lower job title (fellow or part-time lecturer) was associated with higher cynicism (0.90; 95% CI, 0.04, 1.75; p = 0.04). CONCLUSIONS: Grit is associated with higher professional efficacy among academic rheumatologists. To prevent burnout among staff, supervisors who manage academic rheumatologists should assess their staff's individual grit.

    DOI: 10.1097/RHU.0000000000001989

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  • Grit personality of physicians and achievement of treatment goals in patients with system lupus erythematosus. International journal

    Ken-Ei Sada, Yoshia Miyawaki, Kenta Shidahara, Shoichi Nawachi, Yu Katayama, Yosuke Asano, Keigo Hayashi, Keiji Ohashi, Eri Katsuyama, Takayuki Katsuyama, Mariko Takano-Narazaki, Yoshinori Matsumoto, Nao Oguro, Yuichi Ishikawa, Natsuki Sakurai, Chiharu Hidekawa, Ryusuke Yoshimi, Dai Kishida, Takanori Ichikawa, Yasuhiro Shimojima, Noriaki Kurita, Nobuyuki Yajima

    Rheumatology (Oxford, England)   62 ( 6 )   2154 - 2159   2023.6

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    OBJECTIVES: Although personality characteristics of patients with SLE affect their disease activity and damage, it is unclear whether those of attending physicians affect the outcomes of patients with SLE. Grit is a personality trait for achieving long-term goals that may influence the decision-making for continuing treatment plans for patients. We aimed to evaluate the relationship between the grit of attending physicians and achievement of treatment goals in patients with SLE. METHODS: This cross-sectional study was conducted at five referral hospitals. The main exposure was 'consistency of interest' and 'perseverance of effort' of the attending physicians, measured by the Short Grit Scale. The primary outcome was achievement of a lupus low disease activity state (LLDAS). The association between physicians' grit score and LLDAS was analysed by generalized estimating equation (GEE) logistic regression with cluster robust variance estimation, with adjustment for confounders. RESULTS: The median (interquartile range) total, consistency and perseverance scores of 37 physicians were 3.1 (2.9-3.6), 3.3 (2.8-3.8) and 3.3 (3.0-3.5), respectively. Among the 386 patients, 154 (40%) had achieved LLDAS. Low consistency score (≤2.75) in physicians was related to LLDAS achievement independently using GEE logistic regression. The score of the question 'I often set a goal but later choose to pursue a different one' was significantly higher in patients achieving LLDAS. CONCLUSIONS: Difficulty of attending physicians to change treatment goals might be related to lower LLDAS achievement in patients with SLE.

    DOI: 10.1093/rheumatology/keac612

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  • Association of alcohol consumption and fatigue in SLE: A cross-sectional study from Lupus Registry of Nationwide Institution (LUNA) cohort. International journal

    Yu Katayama, Yoshia Miyawaki, Kenta Shidahara, Shoichi Nawachi, Yosuke Asano, Keiji Ohashi, Eri Katsuyama, Takayuki Katsuyama, Mariko Narazaki, Yoshinori Matsumoto, Ken-Ei Sada, Nobuyuki Yajima, Yasuhiro Shimojima, Ryusuke Yoshimi, Kunihiro Ichinose, Hiroshi Kajiyama, Michio Fujiwara, Shuzo Sato, Jun Wada

    Lupus   32 ( 4 )   531 - 537   2023.4

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    OBJECTIVE: Fatigue is one of the most common complaints and is a potentially modifiable issue in systemic lupus erythematosus (SLE). Studies suggest that alcohol consumption has a protective effect against the development of SLE; however, an association between alcohol consumption and fatigue in patients with SLE has not been studied. Here, we assessed whether alcohol consumption was associated with fatigue using lupus patient-reported outcomes (LupusPRO). METHODS: This cross-sectional study, conducted between 2018 and 2019, included 534 patients (median age, 45 years; 87.3% female) from 10 institutions in Japan. The main exposure was alcohol consumption, which was defined as the frequency of drinking [<1 day/month (none group), ≤1 day/week (moderate group), and ≥2 days/week (frequent group)]. The outcome measure was the Pain Vitality domain score in LupusPRO. Multiple regression analysis was performed as the primary analysis after adjusting for confounding factors, such as age, sex, and damage. Subsequently, the same analysis was performed as a sensitivity analysis after multiple imputations (MIs) for missing data (n = 580). RESULTS: In total, 326 (61.0%) patients were categorized into the none group, 121 (22.7%) into the moderate group, and 87 (16.3%) into the frequent group. The frequent group was independently associated with less fatigue compared with none group [β = 5.98 (95% CI 0.19-11.76), p = 0.04], and the results did not substantially deviate after MI. CONCLUSIONS: Frequent drinking was associated with less fatigue, which highlights the need for further longitudinal studies focusing on drinking habits in patients with SLE.

    DOI: 10.1177/09612033231159471

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  • A case of sitosterolaemia-caused systemic large-vessel stenosis mimicking Takayasu arteritis in which FDG-PET provided a clue for the differential diagnosis. International journal

    Takato Nakadoi, Eri Katsuyama, Kazuya Matsumoto, Kenta Shidahara, Kei Hirose, Shoichi Nawachi, Yosuke Asano, Yu Katayama, Yoshia Miyawaki, Takayuki Katsuyama, Mariko Takano-Narazaki, Yoshinori Matsumoto, Ken-Ei Sada, Hayato Tada, Jun Wada

    Rheumatology advances in practice   7 ( 3 )   rkad096   2023

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    DOI: 10.1093/rap/rkad096

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  • A case of recurrent IgG4-related disease successfully treated with belimumab after remission of systemic lupus erythematosus. International journal

    Yu Katayama, Takayuki Katsuyama, Kenta Shidahara, Shoichi Nawachi, Yosuke Asano, Keiji Ohashi, Yoshia Miyawaki, Eri Katsuyama, Mariko Narazaki, Yoshinori Matsumoto, Ken-Ei Sada, Jun Wada

    Rheumatology (Oxford, England)   61 ( 10 )   e308-e310   2022.10

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    DOI: 10.1093/rheumatology/keac284

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Awards

  • 第33回日本リウマチ学会中国四国支部学術集会 若手奨励賞

    2022.12   日本リウマチ学会   抜歯相当の歯性感染を有する血管炎患者に関する過去起点コホート研究

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Class subject in charge

  • Gerontology (2025academic year) special  - その他

  • Internal Medicine (3)(Core Clinical Practice) (2025academic year) special  - その他