Fernandes Figueira Institute, Rio de Janeiro, Brazil. marcosad@centroin.com.br. Medical School, Obstetrics Department, Botucatu Sao Paulo State University, Botucatu, Brazil. Department of Obstetrics and Gynecology, University of Pittsburgh, Pittsburgh, PA, USA. Healthy Starts Theme, BC Children's Hospital Research, Vancouver, BC, Canada. Department of Anaesthesiology, Pharmacology and Therapeutics, University of British Columbia, Vancouver, BC, Canada. Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Oxford, UK. Department of Women and Children's Health, School of Life Course Sciences, King's College London, London, UK. Division of Women's Health, Women's Health Academic Centre, King's College London and King's Health Partners, St. Thomas' Hospital, 10th floor, North Wing, London, UK. St. George's, Hospitals NHS Foundation Trust, University of London, London, UK.