1. Department of Orthopaedic Surgery; Seoul National University College of Medicine; 166 Gumiro Bundang-gu Sungnam 463-707 Republic of Korea
2. Spine Center; Seoul National University Bundang Hospital; 166 Gumiro Bundang-gu Sungnam 463-707 Republic of Korea
3. Joint & Spine Laboratory Center; Yonsei Sarang Hospital; 478-3 Bang-bae Seocho Seoul 137-820 Republic of Korea
4. BK21 Project for Medical Science; Yonsei University College of Medicine; Seoul Republic of Korea
5. Department of Orthopaedic Surgery; Seoul National University College of Medicine; Seoul National University Hospital; 101 Daehangno Jongno-gu Seoul 110-744 Republic of Korea