Association between reduced Alpha4Beta2 nicotinic acetylcholine receptor availability and nonmotor symptoms in early drug naive Parkinson disease. - Philipp M. Meyer; Georg A. Becker; Kai Kendziorra; Florian Wegner; Karl Strecker; Marianne Patt; Swen Hesse; Hermann Josef Gertz; Johannes Schwarz; Osama Sabri (NeuroImage, 2010)