1 Centre for Paediatric and Adolescent Medicine, Division for Neuropaediatrics and Metabolic Medicine, Heidelberg University Hospital, D-69120 Heidelberg, Germany. Electronic address: Peter.Burgard@med.uni-heidelberg.de.
2 University Center for Rare Diseases, International Center for Lysosomal Disorders, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
3 Centre des Maladies Moléculaires, Service de Médecine Génétique, CHUV BT-02-252, Lausanne, Switzerland.
4 Centre for Paediatric and Adolescent Medicine, Johannes Gutenberg-Universität Mainz, Villa, Metabolica, Mainz, Germany.
5 Division of Clinical Endocrinology & Metabolism, Academic Medical Center, Amsterdam, Netherlands.
6 Clinic for Pediatrics I, Medical University Innsbruck, Inherited Metabolic Disorders, Innsbruck, Austria.
7 Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria.
8 Dr von Hauner Children's Hospital, University of Munich, Munich, Germany.
9 Charles Dent Metabolic Unit, National Hospital for Neurology and Neurosurgery, London, UK.
10 Centre for Paediatric and Adolescent Medicine, Division for Neuropaediatrics and Metabolic Medicine, Heidelberg University Hospital, D-69120 Heidelberg, Germany.
11 University Children's Hospital Frankfurt, Frankfurt am Main, Germany.
12 Division of Human Genetics, Medical University Innsbruck, Innsbruck, Austria.