1. Diabetes Research Center, Vrije Universiteit Brussel, Brussels, Belgium
2. EPFL ‐ Laboratory of Stem Cell Dynamics, Ecole Polytechnique Federale Lausanne and Department of Experimental Surgery, Lausanne Medical School, Lausanne, Switzerland
3. Department of Cell and Developmental Biology, University College London, London, UK
4. Division of Regenerative Medicine, San Raffaele Scientific Institute, Milan, Italy
5. Department of Biology, Univeristy of Milan, Milan, Italy