1. Department of Endocrinology, University Hospitals Leuven–KU Leuven, Leuven, Belgium.
2. Interuniversity Institute for Biostatistics and Statistical Bioinformatics, KU Leuven and University of Hasselt, Leuven, Belgium.
3. Department of Endocrinology-Diabetology-Metabolism, University Hospital Antwerp - University of Antwerp, Antwerp, Belgium.
4. Department of Endocrinology, OLV Hospital Aalst, Aalst, Belgium.
5. Sanofi-Aventis Denmark A/S, Copenhagen, Denmark.
6. Fonds Wetenschappelijk Onderzoek (FWO), Brussels, Belgium.