1. Department of Laboratory Medicine , Cliniques Universitaires St-Luc and Université Catholique de Louvain , Brussels , Belgium
2. Pôle de recherche en Endocrinologie, Diabète et Nutrition, Institut de Recherche Expérimentale et Clinique, Cliniques Universitaires St-Luc and Université Catholique de Louvain , Brussels , Belgium
3. Department of Endocrinology , CHU de Liège, Domaine Universitaire du Sart Tilman Liège , Belgium
4. Department of Endocrinology , Universitair Ziekenhuis Brussel, UZ Brussel, (Vrije Universiteit Brussel, VUB) , Brussels , Belgium
5. Department of Endocrinology , AZ Brugge Brugge , Belgium
6. Department of Otorhinolaryngology, Section Head and Neck Surgery , UZ Leuven Leuven , Belgium
7. Department of Endocrinology , Ghent University Hospital , Ghent , Belgium
8. Department of Endocrinology , Hopital Erasme Bruxelles , Belgium
9. Department of Nuclear Medecine , Hopital Erasme Bruxelles , Belgium
10. Department of Endocrinology , Cliniques Universitaires St-Luc and Université Catholique de Louvain , Brussels , Belgium
11. Department of Endocrinology , University Hospitals Leuven Leuven , Belgium