1. Department of Endocrinology, University Hospitals Leuven—KU Leuven, Leuven, Belgium.
2. Department of Endocrinology, Diabetology and Metabolism, University of Antwerp—Antwerp University Hospital, Edegem, Belgium.
3. Department of Endocrinology, OLV Hospital Aalst, Aalst, Belgium.
4. Fonds Wetenschappelijk Onderzoek (FWO), Brussels, Belgium.