1. Johns Hopkins University School of Medicine , Baltimore, MD 21205 , United States
2. Mayo Clinic Alix School of Medicine, Mayo Clinic , Jacksonville, FL 32256 , United States
3. Department of Obstetrics and Gynaecology , , Baltimore, MD 21205 , United States
4. Johns Hopkins University , , Baltimore, MD 21205 , United States
5. The James Buchanan Brady Urological Institute , , Baltimore, MD 21205 , United States
6. San Diego Sexual Medicine , San Diego, CA 92120 , United States
7. Scripps Clinic , San Diego, CA 92108 , United States