1. Unidad de Endocrinología Molecular, Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Facultad de Medicina, Universidad Autónoma de Madrid (R.M.C., M.A., G.M.d.E.), 28029 Madrid, Spain
2. Academic Department of Obstetrics and Gynecology, Royal Free and University College London Medical School (E.J.), London, United Kingdom WCIE 6HX
3. Department of Clinical Chemistry, Academic Hopital Erasme (B.G., C.G.), B-1070 Brussels, Belgium
4. Institute of Interdisciplinary Research, Université Libre de Bruxelles (B.C.), B-1070 Brussels, Belgium