Epidemiologic Reports Surveys
Simonazzi, G.; Bisulli, M.; Saccone, G.; Moro, E.; Marshall, A.; Berghella, V.
Department of Medical Surgical Sciences, Division of Obstetrics and Prenatal Medicine, St Orsola Malpighi Hospital, University of Bologna, Bologna, Italy
doi: 10.1097/01.aoa.0000504713.53097.d4