1. Arthritis Research Campaign Epidemiology Unit (A.T., T.W.O., D.M.L., A.J.S., J.D.F.), The University of Manchester, Manchester M15 6PB, United Kingdom
2. Andrology Unit (G.F.), Department of Clinical Physiopathology, University of Florence, I-50019 Florence, Italy
3. Department of Obstetrics, Gynaecology, and Andrology (G.B.), Albert Szent-György Medical University, H-6725 Szeged, Hungary
4. Department of Andrology and Endocrinology (S.B., D.V.), Katholieke Universiteit Leuven B-3000 Leuven, Belgium
5. Department of Medicine (F.F.C.), Santiago de Compostela University, Complejo Hospitalario Universitario de Santiago, Centro de Investigación Biomedical en Red de Fisiopatología Obesidad y Nutrición (CB06/03), Instituto Salud Carlos III, 15076 Santiago de Compostela, Spain
6. Scanian Andrology Centre (A.G.), Department of Urology, Malmö University Hospital, University of Lund, SE-205 06 Malmö, Sweden
7. Department of Endocrinology (T.S.H.), Royal Free and University College Medical School, Royal Free Hospital, London NW3 2QG, United Kingdom
8. Department of Andrology and Reproductive Endocrinology (K.K.), Medical University of Łódź, 90-419 Łódź, Poland
9. Laboratory of Molecular Endocrinology and Oncology (F.L.), Laval University, Quebec City, Quebec, Canada G1V 0A6
10. Division of Developmental Medicine (M.E.J.L.), Human Nutrition Section, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
11. Clinical Gerontology (N.P.), The University of Manchester, Hope Hospital, Salford M6 8HD, United Kingdom
12. Andrology Unit (M.P.), United Laboratories of Tartu University Clinics, 50406 Tartu, Estonia
13. Department of Reproductive Biology (I.T.H.), Imperial College London, Hammersmith Campus, London W12 0HS, United Kingdom
14. The University of Manchester (F.C.W.W.), Manchester Academic Health Science Centre, Department of Medicine, Manchester Royal Infirmary, Manchester M13 9WL, United Kingdom