[1] Univ Manchester, Manchester Royal Infirm, Dept Endocrinol, Manchester M13 9WL, Lancs, England
[2] Univ Florence, Androl Unit, Dept Clin Physiopathol, Florence, Italy
[3] Univ Manchester, Arc Epidemiol Unit, Manchester M13 9WL, Lancs, England
[4] Univ Leeds, Inst Psychol Sci, Leeds, W Yorkshire, England
[5] Univ Manchester, Hope Hosp, Salford M6 8HD, Lancs, England
[6] Albert Szent Gyorgy Med Univ, Dept Obstet Gynaecol & Androl, Szeged, Hungary
[7] Katholieke Univ Leuven, Div Gerontol & Geriatr, Louvain, Belgium
[8] Katholieke Univ Leuven, Ctr Musculoskeletal Res, Dept Expt Med, Louvain, Belgium
[9] Univ Santiago de Compostela, CHUS, CIBER Fisiopatol Obesidad & Nutr CB06 03, Inst Salud Carlos III,Dept Med, Santiago De Compostela, Spain
[10] Lund Univ, Malmo Univ Hosp, Reprod Med Ctr, S-22100 Lund, Sweden
[11] Royal Free Hosp, Sch Med, Dept Endocrinol, Royal Free & Univ Coll Hosp,Med Sch, London, England
[12] Univ London Imperial Coll Sci Technol & Med, Dept Reprod Biol, London, England
[13] Med Univ Lodz, Dept Androl & Reprod Endocrinol, Lodz, Poland
[14] Univ Glasgow, Dept Human Nutr, Glasgow, Lanark, Scotland
[15] Tartu Univ Clin, United Labs, Androl Unit, Tartu, Estonia
[16] Katholieke Univ Leuven, Dept Androl & Endocrinol, Louvain, Belgium