1. Center for Medical Genetics (B.D., J.H., E.D., A.D.P., G.M., J.V., E.D.B.), Ghent University Hospital, B-9000 B-3000 Leuven, Belgium
2. Department of Paediatrics (M.C., J.D.S.), Ghent University Hospital, B-9000 B-3000 Leuven, Belgium
3. Center for Human Genetics (K.D., J.-P.F.), Leuven University Hospitals, B-3000 Leuven, Belgium
4. Center for Medical Genetics (K.K.), Free University of Brussels, B-1090 Brussels, Belgium
5. Clinical Genetics (A.d.K., E.M.d.J.), Erasmus Medical Center, 3075 EA Rotterdam, The Netherlands
6. Center for Human Genetics (K.S.), University of Liège, B-4000 Liège Belgium