1Institute of Human Genetics, Heidelberg University, Im Neuenheimer Feld 366, 69120, Heidelberg, Germany
2Ute Moog performed the present work as senior clinical geneticist at the Department of Clinical Genetics, University Hospital Maastricht and Research Institute Growth & Development (GROW), Maastricht University, Maastricht, The Netherlands. Her clinical and research interests include the etiology of mental retardation and neurocutaneous disorders. She currently works at the Institute of Human Genetics, Heidelberg University, Heidelberg, Germany, where she is vice-head of Clinical Genetics.
3Ingrid van Mierlo is a medical student at Maastricht University, Maastricht. As part of the last year of her studies, she spent a research period at the Department of Clinical Genetics and worked on Sanfilippo B syndrome.
4Henny M.J. van Schrojenstein Lantman-de Valk is a medical specialist for people with intellectual disability (ID) at the service provider "Pepijn en Paulus," Echt. She works as an assistant professor at the Department of General Practice, Maastricht University, and the Governor Kremers Centre of the Maastricht University. She combines research and practice as physician for people with ID and is internationally active as vice president of the International Association for the Scientific Study of Intellectual Disabilities (IASSID).
5Leo Spaapen is a senior scientist at the Department of Biochemical Genetics of the University Hospital Maastricht. His work covers the area of selective screening on Inborn Errors of Metabolism. His research comprises a.o. disorders of glycosylation.
6Marian A. Maaskant is a health scientist and registered as epidemiologist. She currently works as research co-ordinator at "Pepijn and Paulus" (service provider for people with ID) and as senior researcher at Maastricht University/Governor Kremers Center. Her main topics of interest in ID are: ageing, epidemiology, demography, lifestyles.
7Leopold M.G. Curfs is a professor of Learning Disabilities, Department of Clinical Genetics, University Hospital Maastricht and Director of the Governor Kremers Centre, Maastricht University.
