Functional implications of hippocampal degeneration in early Alzheimer's disease: a combined DTI and PET study. - Yakushev, Igor; Schreckenberger, Matthias; Müller, Matthias; Schermuly, Ingrid; Cumming, Paul; Stoeter, Peter; Gerhard, Alex; Fellgiebel, Andreas (European Journal of Nuclear Medicine & Molecular Imaging, 2011)