1. Department of Obstetrics and Gynaecology; Faculty of Medicine; Geneva University Hospitals and University of Geneva; Geneva Switzerland
2. Centro de Investigación en Salud Poblacional -CISAP- (Population Health Research Centre); Hospital GA Carlos G Durand; Buenos Aires Argentina
3. Department of Obstetrics and Gynaecology; Hospital Materno Infantil Ramón Sardá; Buenos Aires Argentina
4. Department of Obstetrics and Gynaecology; University Hospital; University Basel; Basel Switzerland
5. Department of Obstetrics and Gynaecology; Hospital Materno Infantil de San Isidro; San Isidro Provincia de Buenos Aires Argentina
6. Department of Obstetrics and Gynaecology; Faculty of Medicine; University Hospital and University of Bern; Bern Switzerland
7. Department of Obstetrics and Gynaecology; Hospital Donación Francisco Santojanni; Buenos Aires Argentina
8. Department of Obstetrics and Gynaecology; Frauenklinik; Kantonspital; St Gall Switzerland
9. Department of Obstetrics and Gynaecology; Hospital Maternidad Nuestra Señora De Las Mercedes; San Miguel de Tucumán Argentina
10. Department of Obstetrics and Gynaecology; Centre Hospitalier Universitaire Vaudois; Lausanne Switzerland
11. Department of Obstetrics and Gynaecology; Hospital Materno Infantil San Roque; Entre Ríos Argentina
12. Department of Obstetrics and Gynaecology; Hospital Bernardino Rivadavia; Buenos Aires Argentina
13. Department of Obstetrics and Gynaecology; Frauenklinik; Kantonspital; Winterthur Switzerland
14. Department of Obstetrics and Gynaecology; Hospital Héroes de Malvinas; Merlo Provincia de Buenos Aires Argentina
15. Department of Obstetrics and Gynaecology; University Hospital Zürich; Zurich Switzerland
16. Department of Obstetrics and Gynaecology; Hospital Magdalena V. de Martínez; General Pacheco Provincia de Buenos Aires Argentina
17. Department of Obstetrics and Gynaecology; Hospital Dr. Cosme Argerich; Buenos Aires Argentina
18. Department of Obstetrics and Gynaecology; Hospital Carlos G Durand; Buenos Aires Argentina
19. Department of Obstetrics and Gynaecology; Hospital Villa Dolores; Córdoba Argentina
20. Hospital Virgen del Carmen; Zárate Provincia de Buenos Aires Argentina
21. Department of Obstetrics and Gynaecology; Hospital Municipal Ostaciana B de Lavignolle; Morón Provincia de Buenos Aires Argentina
22. Department of Obstetrics and Gynaecology; Hospital Comunal de Tigre; Tigre Provincia de Buenos Aires Argentina
23. Department of Obstetrics and Gynaecology; Hospital J. M. Penna; Buenos Aires Argentina
24. Department of Obstetrics and Gynaecology; Hospital Dr. T. Alvarez; Buenos Aires Argentina
25. Department of Obstetrics and Gynaecology; Hospital Interzonal Alberto Antranik Eurnekian; Ezeiza Provincia de Buenos Aires Argentina
26. Department of Obstetrics and Gynaecology; Hospital J. B. Iturraspe; Santa Fe Argentina
27. Department of Obstetrics and Gynaecology; Academic Medical Centre; Amsterdam the Netherlands