[1] Natl Univ Singapore, NUS Yong Loo Lin Sch Med, 10 Med Dr S117597, Singapore 119077, Singapore
[2] Natl Univ Singapore Hosp, Dept Surg, Singapore 119074, Singapore
[3] Natl Univ Singapore, Saw Swee Hock Sch Publ Hlth, 12 Sci Dr 2,10-01, Singapore 117549, Singapore
[4] Natl Univ Hlth Syst, 12 Sci Dr 2,10-01, Singapore 117549, Singapore
[5] SingHealth Duke NUS Global Hlth Inst, Singapore 169857, Singapore