1. Department of Neurology; University of Kansas Medical Center; 3901 Rainbow Boulevard, MS 2012, Kansas City Kansas, 66160 USA
2. The Forbes Norris MDA/ALS Research Center; California Pacific Medical Center; San Francisco California USA
3. Department of Neurology; University of California, Irvine; Irvine California USA
4. Department of Neurology; University of Pennsylvania; Philadelphia Pennslyvania USA
5. Department of Neurology; University of Texas Southwestern Medical Center; Dallas Texas USA
6. Department of Neurology; Columbia University; New York New York USA
7. Department of Neurology; University of Nebraska Medical Center; Omaha Nebraska USA
8. Phoenix Neurological Associates; Phoenix Arizona USA
9. Department of Neurology; St. Louis University; St. Louis Missouri USA
10. Department of Neurology; Oregon Health and Science University; Portland Oregon USA
11. Department of Biosciences; Kansas City University of Medicine and Bioscience; Kansas City Missouri USA