About the Authors

Yasuo Niki

y-niki@a8.keio.jp

Affiliation Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan

Tsutomu Takeuchi

Affiliations Division of Rheumatology, Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan, Division of Rheumatology and Clinical Immunology, Saitama Medical Center, Saitama, Japan

Masanori Nakayama

Affiliation Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan

Hayato Nagasawa

Affiliation Division of Rheumatology and Clinical Immunology, Saitama Medical Center, Saitama, Japan

Takahiko Kurasawa

Affiliation Division of Rheumatology and Clinical Immunology, Saitama Medical Center, Saitama, Japan

Harumoto Yamada

Affiliation Department of Orthopaedic Surgery, Fujita Health University, Nagoya, Japan

Yoshiaki Toyama

Affiliation Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan

Takeshi Miyamoto

Affiliation Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YN TT. Performed the experiments: MN HN TK. Analyzed the data: YN TT. Contributed reagents/materials/analysis tools: HY YT. Wrote the paper: YN TM. Proof check of English: YT TM.