1. Neurological Institute of New York, Columbia University, New York, NY, USA
2. Health Science Center, The University of Texas, San Antonio, TX, USA
3. Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
4. Italfarmaco SpA, Milan, Italy
5. Atrium Health Neurosciences Institute, Carolinas Medical Center, University of North Carolina School of Medicine, Charlotte, NC, USA, and
6. Neuromuscular Centre, Neurological Institute, Cleveland Clinic, Cleveland, OH, USA