1. Department of Endocrinology (A.R., T.P.L., B.H.R.W.), University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands
2. Department of Internal Medicine (S.J.L.B., R.O.B.G.), University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands