1 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, National University Hospital, Singapore. Electronic address: pradip_dashraath@nuhs.edu.sg.
2 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, National University Hospital, Singapore.
3 Division of Genetics and Metabolism, Department of Pediatrics, Khoo Teck Puat-National University Children's Medical Institute, National University Hospital, Singapore.