[1] Mahidol Univ, Ramathibodi Hosp, Dept Orthopaed, Bangkok 10400, Thailand
[2] Univ Calif Los Angeles, Dept Orthopaed Surg, Los Angeles, CA 90404 USA
[3] Chang Gung Univ, Chang Gung Mem Hosp, Dept Orthopaed Surg, Tao Yuan 333, Taiwan
[4] Chonbuk Natl Univ Hosp, Chonbuk Natl Univ Med Sch, Dept Orthopaed Surg, Jeonju 561712, South Korea