1. Department of Internal Medicine III, Erasmus University Medical School, 3000 DR Rotterdam, The Netherlands; part of Postgraduate School Molecular Medicine: Pathophysiology of Growth and Differentiation; Center for Biotechnology (G.G.J.M.K., J.-A.G.)
2. Department of Biosciences, Karolinska Institute, Huddinge, Sweden; Department of Endocrinology (C.W.G.M.L.), Academic Hospital Leiden, The Netherlands