[1] Shiga Univ Med Sci, Dept Orthopaed Surg, Seta Tsukinowa Cho, Otsu, Shiga 5202192, Japan
[2] Tokyo Med & Dent Univ, Dept Orthoped Surg, Bunkyo Ward, 1-5-45 Yushima, Tokyo 1138519, Japan
[3] Saiseikai Kawaguchi Gen Hosp, Dept Orthoped Surg, 5-11-5 Nishikawaguchi, Kawaguchi, Saitama 3328558, Japan
[4] Kudanzaka Hosp, Dept Orthoped Surg, Chiyoda Ku, 1-6-12 Kudanminami, Tokyo 1020074, Japan
[5] Wakayama Med Univ, Dept Orthopaed Surg, 811-1 Kimiidera, Wakayama 6418510, Japan
[6] Hirosaki Univ, Grad Sch Med, Dept Orthoped Surg, 5 Zaifu Cho, Hirosaki, Aomori 0368562, Japan
[7] Niigata Univ, Med & Dent Gen Hosp, Dept Orthoped Surg, Chuo Ward, 1-754 Asahimachidori, Niigata, Niigata 9518520, Japan
[8] Univ Tsukuba, Fac Med, Dept Orthoped Surg, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058575, Japan
[9] Jichi Med Univ, Dept Orthoped, 3311-1 Yakushiji, Shimotsuke, Tochigi 3290498, Japan
[10] Chiba Univ, Grad Sch Med, Dept Orthoped Surg, Chuo Ward, 1-8-1 Inohana, Chiba, Chiba 2600856, Japan
[11] Keio Univ, Sch Med, Dept Orthopaed Surg, Shinjuku Ward, 35 Shinanomachi, Tokyo 1608582, Japan
[12] Yamaguchi Univ, Grad Sch, Dept Orthoped Surg, Med, 1-1-1 Minami Kogushi, Ube, Yamaguchi 7558505, Japan
[13] Osaka Rosai Hosp, Dept Orthoped Surg, 1179-3 Nagasonecho, Sakai, Osaka 5918025, Japan
[14] Univ Tokyo, Fac Med, Dept Orthopaed Surg, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan
[15] Nagoya Univ, Grad Sch Med, Dept Orthoped Surg, Showa Ward, 65 Tsurumaicho, Nagoya, Aichi 4668550, Japan
[16] Hokkaido Univ, Fac Med, Dept Orthopaed Surg, Kita 15,Nishi 7, Sapporo, Hokkaido 0608638, Japan
[17] Hokkaido Univ, Grad Sch Med, Kita 15,Nishi 7, Sapporo, Hokkaido 0608638, Japan
[18] Univ Fukui, Fac Med Sci, Dept Orthopaed & Rehabil Med, 23-3 Matsuoka Shimoaizuki, Eiheiji, Fukui 9101193, Japan
[19] Tokyo Med Univ, Dept Orthoped Surg, Shinjuku Ku, 6-7-1 Nishishinjuku, Tokyo 1600023, Japan
[20] Kitasato Univ, Sch Med, Dept Orthoped Surg, Minami Ku, 1-15-1 Kitazato, Sagamihara, Kanagawa 2520375, Japan
[21] Osaka Univ, Grad Sch Med, Dept Orthoped Surg, 2-2 Yamadaoka, Suita, Osaka 5650871, Japan
[22] Kurume Univ, Sch Med, Dept Orthopaed Surg, 67 Asahi Machi, Kurume, Fukuoka 8300011, Japan
[23] Hamamatsu Univ, Sch Med, Dept Orthoped Surg, 1-20-1 Handayama, Hamamatsu, Shizuoka 4313125, Japan
[24] Kanazawa Univ, Grad Sch Med Sci, Dept Orthopaed Surg, 13-1 Takara Machi, Kanazawa, Ishikawa 9208641, Japan
[25] Univ Yamanashi, Dept Orthoped Surg, Chuo Ward, 1110 Shimokato, Yamanashi 4093898, Japan
[26] Dokkyo Med Univ, Sch Med, Dept Orthopaed Surg, 880 Kitakobayashi, Mibu, Tochigi 3210293, Japan
[27] Kyoto Univ, Grad Sch Med, Dept Orthopaed Surg, Sakyo Ku, 54 Kawahara Cho, Kyoto 6068507, Japan
[28] Tokai Univ, Sch Med, Dept Orthoped Surg, Surg Sci, 143 Shimokasuya, Isehara, Kanagawa 2591193, Japan
[29] Tohoku Univ, Sch Med, Dept Orthopaed Surg, Aoba Ward, 1-1 Seiryomachi, Sendai, Miyagi 9808574, Japan
[30] Univ Toyama, Fac Med, Dept Orthoped Surg, 2630 Sugitani, Toyama, Toyama 9300194, Japan
[31] Japanese Multictr Res Org Ossificat Spinal Ligame, Tokyo, Japan