1. Department of Molecular and Clinical Medicine; The Wallenberg Laboratory; University of Gothenburg; Gothenburg Sweden
2. Institute for Clinical Molecular Biology; University of Kiel; Kiel Germany
3. Center of Molecular Life Sciences; University of Kiel; Kiel Germany
4. Faculty of Health Sciences, Novo Nordisk Foundation Center for Basic Metabolic Research, Section for Metabolic Receptology and Enteroendocrinology; University of Copenhagen; Copenhagen Denmark