BatesD., A Prospective Study of Nontraumatic Coma: Methods and Results in 310 Patients, Annals of Neurology2(2):3–211 (September 1977) at 211. See also CranfordR.E.SmithH.L., Some Critical Distinctions Between Brain Death and the Persistent Vegetative State, Ethics in Science & Medicine6:199–209 (1979).