1. Neuroregeneration Institute, McLean Hospital/Harvard Medical School, Belmont, MA 02478, USA.
2. Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, and Departments of Neurology and Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
3. Departments of Neurology, Psychiatry, and Pathology and Cell Biology, Sergievsky Center, Taub Institute and the Center for Motor Neuron Biology and Disease, Columbia University, New York, NY 10032, USA.
4. MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129, USA.
5. Department of Physiology, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA.
6. Department of Pathology and Laboratory Medicine, Institute on Aging and Center for Neurodegenerative Disease Research, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.
7. Department of Physiology and Biophysics, State University of New York at Buffalo, Buffalo, NY 14214, USA.
8. Departments of Neurology and Neuroscience, Mayo Clinic, Jacksonville, FL 32224, USA.
9. University of Florida Shands, Jacksonville, FL 32209, USA.
10. Department of Neurology, Medical University of Silesia, Katowice 40-055, Poland.
11. Section of Clinical and Molecular Neurogenetics at the Department of Neurology, University of Luebeck, 23562 Luebeck, Germany.