1. Department of Pediatrics University of Groningen, University Medical Center Groningen Groningen The Netherlands
2. Department of Metabolic Diseases, Beatrix Children's Hospital University of Groningen, University Medical Center Groningen Groningen The Netherlands
3. Department of Medicine, Division of Endocrinology Leiden University Medical Center Leiden The Netherlands
4. Einthoven Laboratory for Experimental Vascular Medicine Leiden University Medical Center Leiden The Netherlands
5. Department of Laboratory Medicine University of Groningen, University Medical Center Groningen Groningen The Netherlands
6. Institut National de la Santé et de la Recherche Médicale, U1213 Lyon France
7. Université de Lyon Lyon France
8. Université Lyon 1 Villeurbanne France