Decreased P-glycoprotein function at the blood-brain barrier in patients with Alzheimer's disease as shown by (R)-[11C]verapamil and PET. - Danielle M. E. van Assema; Mark Lubberink; Nikie J. Hoetjes; Harry H. Hendrikse; Robert C. Schuit; Albert D. Windhorst; Wiesje M. van der Flier; Philip Scheltens; Adriaan A. Lammertsma; Bart N. M. van Berckel (NeuroImage, 2010)