1. Department of Public Health and Primary Care, Biomedical Quality Assurance Research Unit; KU Leuven; Leuven Belgium
2. Department of Laboratory Medicine, UK NEQAS for Molecular Genetics, UK NEQAS Edinburgh; The Royal Infirmary of Edinburgh; Edinburgh UK
3. EMQN, Manchester Centre for Genomic Medicine; St Mary's Hospital; Manchester M13 9WL UK