1. Department of Orthopedic Surgery, Soon Chun Hyang University Seoul Hospital, Korea.
2. Department of Orthopedic Surgery, Seoul Paik Hospital, Inje University College of Medicine, Korea.
3. Department of Biostatistics, Soon Chun Hyang University Seoul Hospital, Seoul, Korea.
4. Division of Genome Research, Center for Genome Science, Korea National Institute of Health, Cheongju, Korea.
5. Department of Orthopedic Surgery, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea.