1. Department of Metabolic Diseases, Wilhelmina Children's Hospital University Medical Center Utrecht Utrecht The Netherlands
2. Department of Pediatric Nephrology, Wilhelmina Children's Hospital University Medical Center Utrecht Utrecht The Netherlands
3. Department of Clinical Genetics Radboud University Medical Center Nijmegen The Netherlands
4. Department of Ophthalmology Radboud University Medical Center Nijmegen The Netherlands
5. Bartiméus Diagnostic Center for Complex Visual Disorders Zeist The Netherlands