1. Department of Endocrinology, University Hospital (R.A., K.V.A.), Antwerp
2. Middelheim Hospital (J.V., C.M.), Antwerp
3. Hôpital Saint-Luc (D.M.), Brussels
4. Onze Lieve Vrouw Hospital (F.N.), Aalst
5. Salvator Hospital (J.-L.C.), Hasselt
6. Centre Hospitalier Universitaire (A.B.), Liège, Belgium