[1] Ghent Univ Hosp, Ctr Med Genet, B-9000 Ghent, Belgium
[2] Ghent Univ Hosp, Dept Paediat, B-9000 Ghent, Belgium
[3] Leuven Univ Hosp, Ctr Human Genet, B-3000 Louvain, Belgium
[4] Free Univ Brussels, Ctr Med Genet, B-1090 Brussels, Belgium
[5] Erasmus MC, NL-3075 EA Rotterdam, Netherlands
[6] Univ Liege, Ctr Human Genet, B-4000 Liege, Belgium