| Affiliation: | 1. Department of Orthopedic Surgery, NHIC Ilsan Hospital, Yonsei University College of Medicine, Seoul 411-360, South Korea;2. Department of Orthopedic Surgery, Spinal Injuries Center, Fukuoka City 820-8508, Japan;3. Department of Orthopedic Surgery, Barnes-Jewish Hospital, Washington University School of Medicine, St Louis, MO 63110, USA;1. Department of Obstetrics and Gynecology, China Medical University–affiliated Shengjing Hospital, Shenyang, China;2. Department of Obstetrics and Gynecology, People''s Liberation Army hospital No. 202, Shenyang, China |
