1. Department of Orthopedic Surgery, The Catholic University of Korea College of Medicine, Seoul, Korea.
2. Department of Orthopedic Surgery, Inha University School of Medicine, Incheon, Korea.
3. Department of Orthopedic Surgery, Hallym University College of Medicine, Chuncheon, Korea.
4. Department of Orthopedic Surgery, Kyung Hee University School of Medicine, Seoul, Korea.
5. Department of Orthopedic Surgery, Yeungnam University College of Medicine, Daegu, Korea.