α-Synuclein Seed Amplification Assay Amplification Parameters and the Risk of Progression in Prodromal Parkinson Disease.

Coughlin DG, Shifflett B, Farris CM, Ma Y, Galasko D, Edland SD, Mollenhauer B, Brumm MC, Poston KL, Marek K, Siderowf AD, Soto C, Concha-Marambio L; as the Investigators of the Parkinson's Progression Marker Initiative.