1. Division of Health Science, Osaka University, Japan
2. Department of Clinical Nursing, Akita University: 1-1-1 Hondo, Akita City, Akita 010-8543, Japan
3. Department of Orthopaedic Surgery, Hiraka General Hospital, Japan
4. Department of Orthopaedic Surgery, Sendai Red Cross Hospital, Japan
5. Sendai Orthopaedic Hospital, Japan