1. Department of Public Health; Osaka City University Faculty of Medicine; Osaka Japan
2. Department of Orthopaedic Surgery; Kyushu Rosai Hospital of Japan Labor Health and Welfare Organization; Kitakyushu Japan
3. Orthopaedic Division; Nakajo Central Hospital; Tainai Japan
4. Department of Orthopedic Surgery; Kitasato University School of Medicine; Sagamihara Japan
5. Department of Orthopaedic Surgery; Kanazawa Medical University; Kahokugun Japan
6. Department of Orthopedics; Mitsuwadai General Hospital; Chiba Japan
7. Department of Orthopaedic Surgery; Nagasaki University Graduate School of Medicine; Nagasaki Japan
8. Department of Orthopaedic Surgery; Japan Community Health Care Organization Yugawara Hospital; Ashigarashimogun Japan
9. Department of Orthopaedic Surgery; Fujita Health University School of Medicine; Toyoake Japan
10. Department of Orthopaedic Surgery; Hiroshima Prefectural Rehabilitation Center; Higashihiroshima Japan
11. Department of Orthopaedic Surgery; Asahikawa Medical University; Asahikawa Japan
12. Department of Bone and Joint Surgery; Seirei Hamamatsu General Hospital; Hamamatsu Japan
13. Department of Orthopaedic Surgery; Okinawa Red Cross Hospital; Naha Japan
14. Tohoku Hip Joint Centre; Matsuda Hospital; Sendai Japan
15. Department of Orthopedic Surgery; Saiseikai Nakatsu Hospital; Osaka Japan
16. Department of Orthopaedic Surgery; Osaka City University Faculty of Medicine; Osaka Japan
17. College of Health Care Management; Miyama Japan