1. Academic Units of Clinical Oncology (D.M.G., R.E.C., B.W.H.), University of Sheffield, Sheffield S10 2JF, United Kingdom
2. School of Health and Related Research (S.J.W.), University of Sheffield, Sheffield S10 2JF, United Kingdom
3. Department of Bone Metabolism (R.E.), University of Sheffield, Sheffield S10 2JF, United Kingdom
4. Department of Child Health (H.A.D.), University of Sheffield, Sheffield S10 2JF, United Kingdom
5. Department of Haematology (J.A.S.), University of Sheffield, Sheffield S10 2JF, United Kingdom
6. Department of Center for Sexual Medicine at Sheppard Pratt (L.D.), Baltimore, Maryland 21204
7. Department of Endocrinology (S.M.S.), Christie Hospital Manchester, Manchester M20 4BX, United Kingdom
8. Department of Endocrinology and Reproduction (R.J.M.R.), University of Sheffield, Sheffield S10 2JF, United Kingdom