title: Author Response.
authors.forename: Danna
authors.initials: D
authors.lastname: Jennings
authors.forename: Andrew
authors.initials: A
authors.lastname: Siderowf
authors.forename: Matthew
authors.initials: M
authors.lastname: Stern
authors.forename: John
authors.initials: J
authors.lastname: Seibyl
authors.forename: Shirley
authors.initials: S
authors.lastname: Eberly
authors.forename: David
authors.initials: D
authors.lastname: Oakes
authors.forename: Kenneth
authors.initials: K
authors.lastname: Marek
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D010300:Parkinson Disease / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D062706:Prodromal Symptoms; D015899:Tomography, Emission-Computed, Single-Photon