- Correspondence to Dr Kou Katayama, Rheumatology, Katayama Orthopedic Rheumatology Clinic, Asahikawa, Hokkaido 078-8243, Japan;
- Received May 1, 2020
- Revised May 6, 2020
- Accepted May 6, 2020
- First published May 29, 2020.
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