Cortical hypoperfusion in Parkinson's disease assessed using arterial spin labeled perfusion MRI. - María A. Fernández-Seara; Elisa Mengual; Marta Vidorreta; Maite Aznárez-Sanado; Francis R. Loayza; Federico Villagra; Jaione Irigoyen; María A. Pastor (NeuroImage, 2012)