1. Institute of Experimental Genetics, German Mouse Clinic, Helmholtz-Zentrum München; German Research Center for Environmental Health, GmbH, Neuherberg Germany
2. Institute of Molecular Animal Breeding and Biotechnology, Gene Center, Ludwig-Maximilians-Universität München; Munich Germany
3. Institute of Experimental Genetics, Life and Food Science Center Weihenstephan, Technische Universität München; Freising-Weihenstephan Germany
4. German Research Center for Diabetes Research; Neuherberg Germany