1. School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
2. CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria.
3. Center for Regenerative Therapies, Technische Universität Dresden, Dresden, Germany.
4. Faculty of Medicine, Department of Ophthalmology, University of Bonn, Bonn, Germany.