1. Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, USA
2. Department of Obstetrics and Gynecology, Augusta University, Augusta, USA
3. Department of Obstetrics and Gynecology, Pennsylvania State University, Hershey, USA
4. Department of Obstetrics and Gynecology, University of Pennsylvania School of Medicine, Philadelphia, USA
5. Department of Biostatistics, Yale University School of Public Health, New Haven, USA
6. Department of Obstetrics and Gynecology, University of Oklahoma College of Medicine, Oklahoma City, USA
7. Urology Department, Upstate Medical University, Syracuse, USA
8. Department of Urology, University of North Carolina School of Medicine, Chapel Hill, USA