1. Department of Pediatric Gastroenterology, Hepatology and Nutrition, Hospital Necker-Enfants Malades, University of Paris-René Descartes, Paris, France
2. Department of Biology, University Hospital Pitié-Salpétrière, Paris, France
3. Laboratoires Lilly France, Saint Cloud, France
4. Department of Biology, Hospital Necker-Enfants Malades, University of Paris-René Descartes, Paris, France
5. Pharmacy, Hospital Necker-Enfants Malades, University of Paris-René Descartes, Paris, France