1. Rush University Medical Center, Chicago, Illinois
2. Guys and St. Thomas Hospitals London, London, United Kingdom
3. Family Medicine and Urology, Warren Alpert School of Medicine, Brown University, Providence, Rhode Island
4. University of Minnesota, Minneapolis, Minnesota
5. The James Buchanan Brady Urological Institute, The Johns Hopkins Hospital, Baltimore, Maryland
6. Centre d'Etude et de Traitement de la Pathologie de l'Appareil Reproducteur et de la Psychosomatique, Lille, France
7. University of North Carolina, Chapel Hill, North Carolina
8. Baylor College of Medicine and St. Luke's Episcopal Hospital, Houston, Texas
9. Alvarado Hospital, San Diego, California
10. Center for Sexual Function/Endocrinology, Lahey Clinic Medical Center, Peabody, Massachusetts
11. Tufts University School of Medicine, Boston, Massachusetts
12. Good Hope Hospital, Birmingham and Andrology Research Unit, Developmental and Regenerative Biomedicine Research Group, The University of Manchester, Manchester Academic Health Science Centre, Manchester, United Kingdom
13. Good Samaritan Hospital and Department of Medicine, Keck School of Medicine at University of Southern California, Los Angeles, California
14. University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, New Brunswick, New Jersey
15. Centro Cardiologico Monzino, Istituto di Ricovero e Cura a Carattere Scientifico, Institute of Cardiology University of Milan, Milan, Italy
16. Complete Healthcare Communications, Inc., Chadds Ford, Pennsylvania
17. New England Research Institutes, Inc., Watertown, Massachusetts
18. State University of New York-Downstate Medical Center, Brooklyn, New York
19. Cooper University Hospital, Camden, New Jersey
20. Athens Medical School, Athens, Greece
21. Manchester Royal Infirmary, Manchester, United Kingdom