1. Department of Experimental and Clinical Biomedical Sciences; Sexual Medicine and Andrology Unit; University of Florence; Florence Italy
2. Andrology Research Unit; Centre for Endocrinology and Diabetes; Central Manchester University Hospitals NHS Foundation Trust; University of Manchester; Manchester UK
3. Department of Diabetes and Endocrinology; Barnsley Hospital NHS Foundation Trust; Barnsley UK
4. Department of Cardiology; London Bridge Hospital; London UK
5. Center for Reproductive Medicine and Andrology; Martin Luther University Halle-Wittenberg; Halle Germany
6. Holly Cottage Clinic; Lichfield UK
7. Carlos Haya University Hospital; Malaga Spain
8. Ospedali Riuniti - Ancona; Ancona Italy
9. Division of Endocrinology, Diabetes and Metabolism; The Johns Hopkins University School of Medicine; Baltimore MD USA
10. Karolinska University Hospital; Stockholm Sweden
11. University of Parma; Parma Italy
12. Department of Endocrinology; Baylor College of Medicine; Houston TX USA
13. Sapienza University of Rome; Rome Italy
14. Institute of Genetic Medicine; University of Newcastle-on-Tyne; Newcastle-on-Tyne UK
15. New England Research Institutes, Inc.; Watertown MA USA