1. From the Department of Molecular and Clinical Medicine, Wallenberg Laboratory, Sahlgrenska University Hospital, University of Gothenburg, Sweden (A.L.J., R.C., R.A., C.R., F.F.H., J.B., F.B.)
2. Novo Nordisk Foundation Center for Basic Metabolic Research, Section for Metabolic Receptology and Enteroendocrinology, University of Copenhagen, Denmark (F.B.).