Covariance PET patterns in early Alzheimer's disease and subjects with cognitive impairment but no dementia: utility in group discrimination and correlations with functional performance. - Nikolaos Scarmeas; Christian G. Habeck; Eric Zarahn; Karen E. Anderson; Aileen Park; H. John Hilton; Gregory H. Pelton; Matthias Tabert; Lawrence S. Honig; James Ralph Moeller; Davangere P. Devanand; Yaakov Stern (NeuroImage, 2004)