1. Sean M. Healey and AMG Center for ALS, Massachusetts General Hospital, Boston, MA, USA
2. Duke University School of Medicine, Durham, NC, USA
3. Johns Hopkins Berman Institute of Bioethics, Baltimore, MD, USA
4. Formerly Mitsubishi Tanabe Pharma America, Inc., Jersey City, NJ, USA, and
5. Mitsubishi Tanabe Pharma America, Inc., Jersey City, NJ, USA