1. Department of Physiological ChemistryUniversity Medical Centre Utrecht Utrecht The Netherlands
2. Centre for Biomedical GeneticsUniversity Medical Centre Utrecht Utrecht The Netherlands
3. Department of Metabolic and Endocrine DiseasesUniversity Medical Centre Utrecht Utrecht The Netherlands
4. Netherlands Metabolomics Centre Utrecht The Netherlands
5. Department of Cell Biology and GeneticsErasmus Medical CenterUniversity Medical Center Rotterdam Rotterdam The Netherlands