1. Center for Human Genetics; Cliniques Universitaires St. Luc; Université Catholique de Louvain; Brussels Belgium
2. Pediatric Department; Cliniques Universitaires St. Luc; Université Catholique de Louvain; Brussels Belgium
3. Division of Human Genetics and Department of Pediatrics; The Children's Hospital of Philadelphia; Perelman School of Medicine at the University of Pennsylvania; Philadelphia Pennsylvania
4. Institute for Maternal and Child Health IRCCS “B Garofolo”; Trieste Italy