1. Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, Chuo-ku, Kobe 650-0017, Japan
2. Division of Rehabilitation Medicine, Kobe University Graduate School of Medicine, Chuo-ku, Kobe 650-0017, Japan
3. Department of Orthopaedic Surgery, Hyogo Rehabilitation Centre, Nishi-ku, Kobe 651-2181, Japan