1. Department of Orthopedics, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan
2. Health Insurance Naruto Hospital, 32 Odani, Kurosaki, Muya-cho, Naruto, Japan
3. Anan Central Hospital of the Medical Association, 2 Kawahara, Takarada-cho, Anan, Tokushima, Japan