[1] Osaka City Univ, Dept Orthoped Surg, Osaka, Japan
[2] Yodogawa Christians Hosp, Dept Orthoped Surg, Osaka, Japan
[3] Osaka City Univ, CSDD, Osaka, Japan
[4] Shirahama Fdn Hlth & Welf, Osaka, Japan
[5] Shiraharna Fdn Hlth & Welf, Search Inst Bone & Arthrit Dis SINBAD, Wakayama, Japan
[6] Osaka City Gen Hosp, Dept Orthoped Surg, Osaka, Japan
[7] Osaka City Univ, Dept Dermatol, Osaka, Japan