1. Department of Rehabilitation Medicine, Lohas Gwangmyeong Convalescent Hospital, Republic of Korea
2. Department of Rehabilitation Medicine, Jeju National University Hospital, Jeju National University School of Medicine: Aran 13 gil 15, Jeju-si, Jeju 690-767, Republic of Korea
3. Department of Orthopedic Surgery, Jeju National University Hospital, Jeju National University College of Medicine, Republic of Korea