Authors: Maria Regina Torloni; Ana Pilar Betrán; Pilar Montilla; Elisa Scolaro; Armando Seuc; Agustina Mazzoni; Fernando Althabe; Francesca Merzagora; Gian Paolo Donzelli; Mario Merialdi Journal: BMC Pregnancy Childbirth Date: 2013-03-26 Impact factor: 3.007