1 Department of Rheumatology, Japan Community Healthcare Organization Osaka Hospital, 4-2-78 Fukushima, Fukushima-ku, Osaka City, Osaka, 553-0003, Japan. ni4kawa-ma@umin.ac.jp.
2 Department of Orthopaedic Surgery, Japan Community Healthcare Organization Osaka Hospital, 4-2-78 Fukushima, Fukushima-ku, Osaka City, Osaka, 553-0003, Japan.