[1] Natl Univ Hlth Syst, Natl Univ Hosp, Dept Orthopaed Surg, Singapore 119074, Singapore
[2] Natl Univ Hlth Syst, Natl Univ Hosp, Dept Diagnost Imaging, Singapore 119074, Singapore
[3] Nanyang Technol Univ, Lee Kong Chian Sch Med, Singapore 636921, Singapore
[4] Natl Univ Singapore, Yong Loo Lin Sch Med, Biostat Unit, Singapore 117597, Singapore