1 Department of endocrinology and reproductive medicine, GH Pitié-Salpêtrière, 47-83, boulevard de l'Hôpital, 75651 Paris cedex 13, France. Electronic address: philippe.touraine@psl.aphp.fr.
2 Department of endocrinology and reproductive medicine, GH Pitié-Salpêtrière, 47-83, boulevard de l'Hôpital, 75651 Paris cedex 13, France.