1. Integrative Physiology, Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden;
2. Institut Cochin, Universite Paris Descartes, CNRS (UMR 8104), Department of Endocrinology, Metabolism and Cancer, Paris, France; and
3. Institut National de la Santé et de la Recherche Médicale, U567, Paris, France