title: Reply to V Ansu and K He.
authors.affiliation: From the Department of Obstetrics and Gynecology, Yong Loo Lin School of Medicine (A-RC), and the Saw Swee Hock School of Public Health (MF-FC, e-mail: mary_chong@sics.a-star.edu.sg), National University of Singapore and National University Health System, Singapore.
authors.forename: Ai-Ru
authors.identifier: 0000-0003-1694-0235
authors.initials: AR
authors.lastname: Chia
authors.affiliation: From the Department of Obstetrics and Gynecology, Yong Loo Lin School of Medicine (A-RC), and the Saw Swee Hock School of Public Health (MF-FC, e-mail: mary_chong@sics.a-star.edu.sg), National University of Singapore and National University Health System, Singapore.
authors.forename: Mary Foong-Fong
authors.initials: MF
authors.lastname: Chong