1. Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University,
1-8-1 Inohana, Chuo-ku, Chiba, Chiba 260-8677, Japan
2. Chibaken Saiseikai Narashino Hospital,
1-1-1 Izumi-cho, Narashino, Chiba 275-8580, Japan
3. Matsudo City Hospital,
4005 Kamihongo, Matsudo, Chiba 271-8511, Japan
4. Funabashi Orthopaedic Hospital,
1-833 Hasama, Funabashi, Chiba 274-0822, Japan
5. Chiba University Hospital Clinical Research Center,
1-8-1 Inohana, Chuo-ku, Chiba, Chiba 260-8677, Japan