1. Red Cross College of Nursing, Chung-Ang University, Seoul, Korea.
2. Department of Orthopaedic Surgery, Eulji Medical Center, Eulji University College of Medicine, Seoul, Korea.
3. Departments of Urology, Chung-Ang University College of Medicine, Seoul, Korea.
4. Department of Orthopaedic Surgery, Gyeongsang National University Hospital, Jinju, Korea.
5. Department of Orthopaedic Surgery, Chung-Ang University College of Medicine, Seoul, Korea.