1. Andrology Research Unit (S.R.P., J.D.F., F.C.W.W.), Manchester M13 9WL, United Kingdom
2. Arthritis Research UK Epidemiology Unit (S.R.P., D.M.L., T.W.O., A.T.), Manchester Academic Health Science Centre, The University of Manchester, Manchester M13 9WL, United Kingdom
3. Department of Surgery and Cancer (I.T.H.), Imperial College London, Hammersmith Campus, London W12 ONN, United Kingdom
4. Department of Obstetrics, Gynaecology, and Andrology (G.B.), Albert Szent-György Medical University, H-6721 Szeged, Hungary
5. Departments of Geriatric Medicine (S.B.), Leuven B-3000, Belgium
6. Department of Medicine (F.F.C.), Santiago de Compostela University, Complejo Hospitalario Universitario de Santiago, and Centro de Investigación Biomédica en Red de Fisiopatologia Obesidad y Nutricion (CB06/03), Instituto Salud Carlos III, 15705 Santiago de Compostela, Spain
7. Endocrinology Unit (G.F.), Department of Clinical Physiopathology, University of Florence, 50121 Florence, Italy
8. Reproductive Medicine Centre (A.G.), Skåne University Hospital, University of Lund, SE-22 184 Lund, Sweden
9. Department of Endocrinology (T.S.H.), University College London, London W1T 3AA, United Kingdom
10. Department of Andrology and Reproductive Endocrinology (K.K.), Medical University of Łódź, 90-419 Łódź, Poland
11. Department of Human Nutrition (M.E.L.), University of Glasgow, Glasgow G12 8TA, United Kingdom
12. School of Community-Based Medicine (N.P.), University of Manchester, Salford Royal National Health Service Trust, Salford M6 8HD, United Kingdom
13. Andrology Unit (M.P.), United Laboratories of Tartu University Clinics, 51014 Tartu, Estonia
14. Manchester Diabetes Centre (M.K.R.), The University of Manchester, Manchester M13 9WL, United Kingdom
15. Andrology and Endocrinology (D.V.), Catholic University of Leuven, Leuven B-3000, Belgium