Affiliation: | 1. Department of Neonatology, Rambam Medical Center, Technion Faculty of Medicine, Haifa, Israel;2. Department of Obstetrics and Gynecology, Hospital Dr. R.A. Calderon Guardia, San Jose, Costa Rica;3. Department of Epidemiology, Technion Faculty of Medicine, Haifa, Israel;4. Department of Obstetrics and Gynecology, Rambam Medical Center, Technion Faculty of Medicine, Haifa, Israel |