[1] Teikyo Univ, Sch Med, Dept Orthopaed Surg, Kaga Itabashi Ku, Tokyo, Japan
[2] Tokyo Univ Hosp, Dept Infect Control, Kaga Itabashi Ku, Tokyo, Japan
[3] Teikyo Univ, Grad Sch Publ Hlth, Kaga Itabashi Ku, Tokyo, Japan
[4] Alpha Code Inc, Toranomon Minato Ku, Tokyo, Japan
[5] Teikyo Univ, Sch Med, Dept Orthopaed Surg, 2-11-1 Kaga Itabashi Ku, Tokyo, Japan