[1] Yamagata Univ, Dept Orthopaed Surg, Fac Med, 2-2-2 Iida Nishi, Yamagata, Yamagata 9909585, Japan
[2] Yamagata Saisei Hosp, Dept Orthopaed Surg, Yamagata, Yamagata, Japan
[3] Yamagata Prefectural Cent Hosp, Dept Orthopaed Surg, Yamagata, Yamagata, Japan
[4] Okitama Publ Gen Hosp, Dept Orthopaed Surg, Yamagata, Japan
[5] Tsuruoka Municipal Shonai Hosp, Dept Orthopaed Surg, Tsuruoka, Yamagata, Japan
[6] Sagae City Hosp, Dept Orthopaed Surg, Sagae, Yamagata, Japan
[7] Yamagata Prefectural Kahoku Hosp, Dept Orthopaed Surg, Yamagata, Japan
[8] Shiseido Hosp, Dept Orthopaed Surg, Yamagata, Yamagata, Japan
[9] Sanyudo Hosp, Dept Orthopaed Surg, Yonezawa, Yamagata, Japan
[10] Saiseikan Yamagata City Hosp, Dept Orthopaed Surg, Yamagata, Yamagata, Japan
[11] Tohoku Cent Hosp, Dept Orthopaed Surg, Yamagata, Yamagata, Japan
[12] Yoshioka Hosp, Dept Orthopaed Surg, Tendo, Yamagata, Japan
[13] Kitamurayama Hosp, Dept Orthopaed Surg, Murayama, Yamagata, Japan
[14] Miyuki Social Med Corp, Miyukikai Hosp, Dept Orthopaed Surg, Kaminoyama, Yamagata, Japan
[15] Yamagata Tolcusyukai Hosp, Dept Orthopaed Surg, Yamagata, Yamagata, Japan
[16] Yamagata Prefectural Shinjo Hosp, Dept Orthopaed Surg, Shinjo, Yamagata, Japan
[17] Shonai Amarume Hosp, Dept Orthopaed Surg, Yamagata, Japan
[18] Sinoda Gen Hosp, Dept Orthopaed Surg, Yamagata, Yamagata, Japan
[19] Mamurogawa Town Hosp, Dept Orthopaed Surg, Yamagata, Japan
[20] Nihonkai Gen Hosp, Dept Orthopaed Surg, Sakata, Yamagata, Japan
[21] Yonezawa City Hosp, Dept Orthopaed Surg, Yonezawa, Yamagata, Japan
[22] Funayama Hosp, Dept Orthopaed Surg, Yonezawa, Yamagata, Japan
[23] Yamagata Univ, Dept Cardiol Pulmonol & Nephrol, Fac Med, Yamagata, Yamagata, Japan