We thank Mr. Chris Russell and Dr. Jillian Casey for their assistance. We thank Jörg Schmidtke for the information on German recommendations on Clinical Genetic staffing requirements. We thank the following for contributing their country’s data: Veselina Gadancheva (Bulgaria), Milan Macek (Czech Republic), Helena Kaarinen (Finland), Stanislas Lyonnet (France), Christine Scholz (Germany), Marleen Kets (Netherlands), Gunnar Houge (Norway), Jorge Sequeiros (Portugal), Ulf Kristoffersson (Sweden), UK data: Carol Gardiner (Scotland), AlexMurray (Wales), Kay Metcalfe (England), Fiona Stewart (Northern Ireland) and Mark Longmuir (UK genetic counsellors).