. . "Contemplated causes of memory impairment include toxicant exposure, brain injury, age-associated memory impairment, mild cognitive impairment, epilepsy, mental retardation in children, and dementia resulting from a disease, such as in certain cases of Parkinson's disease, Alzheimer's disease, AIDS, head trauma, Huntington's disease, Pick's disease, Creutzfeldt-Jakob disease, post cardiac surgery," . . .