From the Department of Human Physiology & Centre for Neuroscience (S.R.S., L.W., T.C., M.-L.R.), Department of Gastroenterology and Surgery, Flinders Medical Centre (P.G.D.), and Department of Human Physiology, Centre for Neuroscience (P.G.D.), Flinders University, Adelaide, South Australia; Department of Neurology (J.W., M.B.), Miller School of Medicine, University of Miami, FL; and Neurology Department and MND Clinic (D.S.), Flinders Medical Centre, Bedford Park, South Australia. (At 2017-03-21)