1. Department of NeurologyUniversity of Utah School of Medicine Salt Lake City Utah
2. Department of NeurologyUniversity of Rochester School of Medicine and Dentistry Rochester New York
3. Department of NeurologyUniversity of Colorado School of Medicine Aurora Colorado
4. Department of NeurologyWashington University School of Medicine St Louis Missouri
5. UC Irvine‐MDA ALS and Neuromuscular CenterUniversity of California Irvine Orange California
6. Department of NeurologyUniversity of Kansas Medical Center Kansas City Kansas
7. Department of NeurologyVirginia Commonwealth University Richmond Virginia