1. Department of Anatomy & Cell Biology, Graduate School of Medicine, Kangwon National University, Kangwon, Republic of Korea
2. Department of Neurosurgery, Chuncheon Sacred Heart Hospital, Hallym University, Chuncheon, Republic of Korea
3. Department of Orthopaedic Surgery, Seoul Metropolitan Government-Seoul National University, Boramae Medical Center, Seoul, Republic of Korea
4. Department of Orthopaedic Surgery, Chuncheon Sacred Heart Hospital, Hallym University, Chuncheon, Republic of Korea
5. Department of biostatistics, Soonchunhyang University Hospital, College of medicine, Seoul, Republic of Korea
6. Institute for Skeletal Aging and Orthopedic Surgery, Chuncheon Sacred Heart Hospital, Hallym University, Chuncheon, Republic of Korea