1. Department of Public Health, State University of Ceara, 60.740-000 Fortaleza, CE, Brazil
2. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynaecology, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada N6H 5W9
3. Department of Perinatal Medicine, Pregnancy Research Centre, The Royal Women's Hospital, 7th Floor, 20 Flemington Road, Parkville, Melbourne, VIC 3052, Australia
4. Department of Obstetrics and Gynaecology, University of Melbourne, Melbourne, VIC 3052, Australia