Institution: | 1. Epidemiological Research Unit on Perinatal and Women's Health, INSERM U149, France;2. Section of Neonatology, Department of Pediatrics, University of Chicago, USA
Department of Obstetrics and Gynecology, University of Chicago, USA;3. Department of Obstetrics and Gynecology, University of Wisconsin, USA;4. National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, MD, USA |