1. University of Auckland; Department of Obstetrics and Gynaecology; Park Rd Grafton Auckland New Zealand 1142
2. Radboud University Nijmegen Medical Centre; Nijmegen Netherlands
3. 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
4. Faculty of Medicine, Mansoura University; Obstetrics & Gynaecology; Mansoura Egypt