1. Department of Orthopaedic Surgery
2. Kawasaki Municipal Kawasaki Hospital, 12-1 Shinkawa-dori, Kawasaki-ku, Kawasaki, Kanagawa 210-0013, Japan.
3. Ogikubo Hospital, 3-1-24 Imagawa, Suginami-ku, Tokyo, 167-0035, Japan.
4. National Center for Child Health and Development, 2-10-1 Ookura, Setagaya-ku, Tokyo 157-8535, Japan.
5. Department of Orthopaedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
6. Matsumura Geka Seikeigeka Clinic, 1-1-6 Baba-dori, Utsunomiya, Tochigi 320-0026, Japan.