1. Department of Obstetrics and Gynecology, University of Zaragoza Faculty of Medicine, Zaragoza, Spain
2. Hospital Lusíadas Porto, Porto, Portugal
3. LAP, Unilabs, Porto, Portugal
4. Lower Genital Tract Unit, Centro Hospitalar de São João, Porto, Portugal
5. Department of Obstetrics, Gynecology and Reproductive Sciences, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ, USA
6. Department of Obstetrics and Gynecology, Helen Schneider Hospital for Women, Rabin Medical Center, Petach Tikva, Israel
7. Department of Obstetrics and Gynecology, Universidade Federal Fluminense Niterói, Rio de Janeiro, Brazil
8. Department of Obstetrics and Gynecology, University of Iowa Hospitals and Clinics, Iowa City, IA, USA