1. Serviço de Genética Médica, Hospital Pediátrico; Centro Hospitalar e Universitário de Coimbra; Coimbra; Portugal
2. GOSgene; UCL Institute of Child Health; London; UK
3. NE Thames Regional Genetics Service Laboratories; Great Ormond Street Hospital for Children; London; UK
4. Molecular Medicine Unit; UCL Institute of Child Health; London; UK
5. Clinical and Molecular Genetics Unit; UCL Institute of Child Health; London; UK
6. Academic Medical Center; University of Amsterdam; Amsterdam; The Netherlands