[1] Chung Ang Univ, Coll Med, Dept Orthoped Surg, Chung Ang Univ Hosp, Seoul, South Korea
[2] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Orthoped Surg, 88 Olymp Ro 43 Gil, Seoul 05505, South Korea
[3] Hallym Univ, Sacred Heart Hosp, Dept Orthoped Surg, Anyang, South Korea