1. Service de Néonatologie, Centre Hospitalier Universitaire Sud Réunion, La Réunion, Saint Pierre, France;
2. Centre d’Etudes Périnatales Océan Indien (CEPOI), Centre Hospitalier Universitaire Sud Réunion, La reunion, Saint Pierre, France;
3. Service de Gynécologie et Obstétrique, Centre Hospitalier Universitaire Sud Réunion, La reunion, Saint Pierre, France;
4. Department of epidemiology, school of public health, West Virginia University, School of Public Health, Morgantown, VA, USA;
5. Department of Obstetrics and Gynaecology, University of Adelaide, Robinson Institute. Lyell McEwin Hospital, Elizabeth Vale, Australia