[1] KK Womens & Childrens Hosp, Div Nursing, 100 Bukit Timah Rd, Singapore 229899, Singapore
[2] Alexandra Hlth Pte Ltd, Div Nursing, Singapore, Singapore
[3] KK Womens & Childrens Hosp, Dept Gynaecol Oncol, Div Obstet & Gynaecol, Singapore, Singapore
[4] Natl Univ Hlth Syst, Dept Obstet & Gynaecol, Singapore, Singapore
[5] Natl Univ Singapore, Yong Loo Lin Sch Med, Singapore, Singapore