1. Eleanor and Lou Gehrig ALS Center, Columbia University, New York, NY, USA,
2. Department of Neurology, Massachussetts General Hospital, Boston, MA, USA,
3. Biomedical Sciences Institute of Neurosciences, The University of Dublin, Dublin, Ireland,
4. Cytokinetics, Inc, South San Francisco, CA, USA, and
5. Department of Neurology, Barrow Neurological Institute, Phoenix, AZ, USA