[1] Univ Sheffield, No Gen Hosp, Div Clin Sci, Sheffield S5 7AU, S Yorkshire, England
[2] Royal Hallamshire Hosp, Dept Endocrinol, Sheffield S10 2JF, S Yorkshire, England
[3] Univ Paris 05, Fac Med Rene Descartes, INSERM, U567,Inst Cochin,Dept Endocrinol, Paris, France
[4] Barts & London Queen Marys Sch Med & Dent, William Harvey Res Inst, Dept Endocrinol, London, England
[5] NICHHD, Reprod Endocrinol & Med Branch, NIH, Bethesda, MD 20891 USA