1. Department of Obstetrics and Gynecology Beth Israel Deaconess Medical Center Boston Massachusetts USA
2. Harvard Medical School Boston Massachusetts USA
3. Department of Anesthesia, Critical Care & Pain Medicine Beth Israel Deaconess Medical Center Boston Massachusetts USA
4. Department of Obstetrics and Gynecology Faculty of Medicine Assiut University Assiut Egypt
5. Fundación Valle Del Lili Cali Colombia
6. St George's University of London London UK
7. Canberra HospitalAustralian National University Canberra Australia
8. Guangzhou Medical University Guangzhou China
9. Universidad de Buenos Aires Buenos Aires Argentina
10. Centre Hospitalier Universitaire de Bordeaux Bordeaux France
11. University of Pretoria Pretoria South Africa
12. Universitas Airlangga Surabaya Indonesia
13. Tehran University of Medical Sciences Tehran Iran
14. Shandong First Medical University Tai'an China
15. Baylor College of Medicine Houston Texas USA