1. University of Sao Paulo; Department of Obstetrics and Gynecology, Medical School of Ribeirao Preto; Hospital das Clinicas da FMRP-USP, 8 andar Campus Universitario da USP Ribeirao Preto Sao Paulo Brazil 14048-900
2. Ultrasonography and Retraining Medical School of Ribeirao Preto (EURP); Rua Casemiro de Abreu, 660 Ribeirao Preto Sao Paulo Brazil 14020-060