1. Department of Internal MedicineYale University School of Medicine New Haven Connecticut USA
2. Department of Cellular and Molecular PhysiologyYale University School of Medicine New Haven Connecticut USA
3. Department of Radiology and Biomedical EngineeringYale University School of Medicine New Haven Connecticut USA
4. Howard Hughes Medical InstituteYale University School of Medicine New Haven Connecticut USA
5. Department of PediatricsYale University School of Medicine New Haven Connecticut USA
6. Novo Nordisk Foundation Center for Basic Metabolic ResearchUniversity of Copenhagen Copenhagen Denmark