title: Prospective research on Parkinson nonmotor symptoms.
authors.forename: Honglei
authors.initials: H
authors.lastname: Chen
authors.forename: Xiang
authors.initials: X
authors.lastname: Gao
authors.forename: Alberto
authors.initials: A
authors.lastname: Ascherio
mesh_terms: D015331:Cohort Studies; D006801:Humans; D010302:Parkinson Disease, Secondary / Q000175:diagnosis* / Q000453:epidemiology / Q000628:therapy*; D011446:Prospective Studies