1. Department of Cell Biology, Center for Molecular Medicine, and
2. Division of Pediatrics, University Medical Center Utrecht, Utrecht, The Netherlands;
3. Department of Gastroenterology and Hepatology, Erasmus Medical Center, Rotterdam, The Netherlands;
4. Department of Metabolic Diseases, University Medical Center Utrecht, Utrecht, The Netherlands; and
5. Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL