1. Stem cell and Brain Research Institute, INSERM U846, 18 Avenue Doyen Lépine, 69500 Bron, France.
2. Université de Lyon, Université Lyon I, 69003 Lyon, France.
3. Yale University, Department of Neurobiology, New Haven, CT 06520, USA.
4. Faculty of Physics, Babeş-Bolyai University, Cluj-Napoca, 400084 Romania.
5. Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, MO 63110–1093, USA.
6. Department of Physics and Interdisciplinary Center for Network Science and Applications, University of Notre Dame, Notre Dame, IN 46556, USA.
7. Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany.