1. Department of Obstetrics and Gynecology,Medical School of Ribeirao Preto; University of Sao Paulo; Ribeirao Preto Brazil
2. School of Health Technology - Ultrasonography School of Ribeirao Preto (FATESA-EURP); Ribeirao Preto Brazil
3. Department of Obstetrics and Gynaecology; Medical University of Graz; Graz Austria
4. Division of Child Health, Obstetrics & Gynaecology, School of Medicine; University of Nottingham; Nottingham UK