1. Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University: 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
2. Faculty of Health Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University, Japan
3. Department of Rehabilitation Medicine, Sonoda Daiichi Hospital, Japan
4. Sonodakai Joint Replacement Center Hospital, Japan
5. Tokyo Metropolitan Rehabilitation Hospital, Japan
6. NEC Livex, Ltd., Japan