id	keyword
dti-1331	memantine
dti-1331	et al
dti-1331	nmda
dti-1331	disease
dti-1331	patients
dti-1331	glutamate
dti-1331	receptors
dti-1331	neurons
dti-1331	alzheimer
dti-1331	severe
dti-1331	effect
dti-1331	dopamine
dti-1331	parkinson
dti-1331	placebo