About the Authors
European Brain Research Institute, Rome, Italy
Unit of Anatomy, Department of Medicine, University of Fribourg, Fribourg, Switzerland
Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, California, United States of America
The authors have declared that no competing interests exist.
The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: FM SM DAP JRH AB. Performed the experiments: FM SM PM AB. Analyzed the data: FM SM AB. Contributed reagents/materials/analysis tools: BS. Wrote the paper: FM DAP JRH AB.