[1] Soonchunhyang Univ, Dept Biostat, Seoul Hosp, Seoul 04401, South Korea
[2] Chung Ang Univ, Dept Appl Stat, Seoul 06974, South Korea
[3] Inje Univ, Dept Orthopaed Surg, Seoul Paik Hosp, Seoul 04551, South Korea
[4] Hallym Univ, Chuncheon Sacred Heart Hosp, Inst Skeletal Aging & Orthoped Surg, Chunchon 24253, South Korea
[5] Armed Force Gangneung Hosp, Dept Orthopaed Surg, Kangnung 25422, South Korea
[6] Soonchunhyang Univ, Dept Orthopaed Surg, Seoul Hosp, Seoul 04401, South Korea
[7] Kangwon Natl Univ, Grad Sch Med, Dept Anat & Cell Biol, Kangwon 24341, South Korea
[8] Hallym Univ, Chuncheon Sacred Heart Hosp, Dept Orthopaed Surg, Chunchon 24253, South Korea