[1] Natl Univ Singapore Hosp, Yong Loo Lin Sch Med, Singapore, Singapore
[2] Natl Univ Singapore Hosp, Ctr Med Educ, Singapore, Singapore
[3] Natl Univ Singapore Hosp, Alice Lee Ctr Nursing Studies, Singapore, Singapore
[4] Natl Univ Singapore Hosp, Div Endocrinol, Singapore, Singapore
[5] Natl Univ Singapore Hosp, Div Colorectal Surg, Singapore, Singapore
[6] Natl Univ Singapore Hosp, Dept Surg, Singapore, Singapore