1. Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland
2. Department of Neurology and Medicine, Medical University of South Carolina, Charleston, South Carolina
3. Department of Neurology, ALS Multidisciplinary Clinic, Ralph H. Johnson Veterans Affairs Medical Center, Charleston, South Carolina
4. ALS Clinic Treatment Center of Excellence, Crestwood Medical Center, Huntsville, Alabama
5. Division of Pulmonary, Critical Care, and Sleep Medicine, MedStar Georgetown University Hospital, Washington, District of Columbia
6. Division of Palliative Care Medicine, MedStar Georgetown University Hospital, Washington, District of Columbia
7. Department of Neurology, University of Colorado School of Medicine, Aurora, Colorado
8. Palliative Care Program, Division of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland