1. Department of Internal Medicine; Centre for Lysosomal and Metabolic Diseases; Erasmus MC University Medical Centre Rotterdam; Rotterdam The Netherlands
2. Department of Neurology; Erasmus MC University Medical Centre Rotterdam; Rotterdam The Netherlands
3. Department of Haematology; Medical Centre Leeuwarden; Leeuwarden The Netherlands
4. Department of Clinical Genetics; Erasmus MC University Medical Centre Rotterdam; Rotterdam The Netherlands