1. Department of Endocrinology and Metabolism (A.H.v.d.S., F.F.B., E.F., A.B.), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands;
2. Department of Cell Biology and Histology (W.T., N.N.v.d.W.), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands;
3. Department of Clinical Medicine and Surgery (M.D., D.S.), University of Naples Federico II, Naples, Italy