[1] Osaka Koseinenkin Hosp, Dept Orthopaed Surg, Osaka, Japan
[2] Takarazuka Daiichi Hosp, Dept Orthopaed Surg, Takarazuka, Hyogo, Japan
[3] Mishuku Hosp, Dept Orthopaed Surg, Tokyo, Japan
[4] Int Univ Hlth & Welf, Tokyo, Japan
[5] Osaka Natl Hosp, Inst Clin Res, Osaka, Japan
[6] Cardiovasc Inst, Tokyo, Japan
[7] Mie Univ, Grad Sch Med, Dept Cardiol & Nephrol, Tsu, Mie 514, Japan