1. Department of Metabolic Diseases Beatrix Children's Hospital, University Medical Centre Groningen, University of Groningen Groningen the Netherlands
2. Department of Pediatric Gastroenterology Hepatology and Nutrition Beatrix Children's Hospital, University Medical Centre Groningen, University of Groningen Groningen the Netherlands
3. Department of Pathology & Medical Biology, Pathology Section, University of Groningen University Medical Center Groningen Hanzeplein Groningen Netherlands
4. Department of Gastroenterology, Hepatology, Feeding Disorders and Pediatrics The Childrens' Memorial Health Institute Warsaw Poland
5. Department of Pediatrics, Nutrition and Metabolic Disorders The Childrens' Memorial Health Institute Warsaw Poland
6. Glycogen Storage Disease Program, Connecticut Children's Medical Center Hartford Connecticut USA
7. Department of Pediatrics University of Connecticut Health Center Farmington Connecticut USA