Affiliation: | 1. Division of Perinatal Medicine, Department of Pediatrics, North Shore University Hospital, Manhasset, N. Y. USA;2. Department of Obstetrics and Gynecology, North Shore University Hospital, Manhasset, N. Y. USA;3. Department of Pediatrics, Cornell University Medical College, Manhasset, N. Y. USA;4. Department of Obstetrics and Gynecology, Cornell University Medical College, Manhasset, N. Y. USA |