1. Institute of Physiology, University of Regensburg, Germany
2. National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
3. Institut National de la Santé et de la Recherche Médicale (INSERM) Unit 36, College de France, Service d’Hematologie Biologique A, Hôpital European, Paris, France
4. Institute of Anatomy, Charité, Berlin, Germany