[1] KEPCO Med Ctr, Dept Orthoped Surg, Seoul, South Korea
[2] Inje Univ, Coll Med, Seoul Paik Hosp, Dept Orthoped Surg, Seoul, South Korea
[3] Univ Ulsan, Coll Med, Gangneung Asan Hosp, Dept Orthoped Surg, Kangnung, South Korea
[4] KonKuk Univ, Med Ctr, Dept Orthoped Surg, Seoul, South Korea