1. Pediatric Gastroenterology and Hepatology; Department of Pediatrics; Center for Liver, Digestive, and Metabolic Diseases; University of Groningen; Beatrix Children's Hospital - University Medical Center Groningen; Groningen the Netherlands
2. Department of Neurology; Virginia Commonwealth University; Richmond VA USA
3. 1st Faculty of Medicine; Institute of Medical Biochemistry and Laboratory Diagnostics; Charles University; Prague Czech Republic
4. 1st Faculty of Medicine; 4th Department of Internal Medicine; Charles University; Prague Czech Republic
5. Department of Child Neurology; Children's Mercy Hospital; University of Missouri; Kansas City Missouri USA