1. Johns Hopkins University School of Medicine, Baltimore, MD, USA
2. Independent ALS Patient Advocate, Denver, CO, USA
3. Coeruleus Clinical Sciences, Woodbridge, CT, USA
4. Yale School of Medicine, New Haven, CT, USA
5. Independent researcher, Glen Burnie, MD, USA
6. Department of Neuroscience, The University of Sheffield, Sheffield, South Yorkshire, UK
7. Department of Neurology, UMC, Utrecht Brain Centre, University Medical Centre Utrecht, Utrecht, the Netherlands
8. Biostatistics & Research Support, Julius Centre for Health Sciences and Primary Care, University Medical Centre Utrecht, Utrecht, the Netherlands