Assessment of heterogeneity among participants in the Parkinson's Progression Markers Initiative cohort using α-synuclein seed amplification: a cross-sectional study

Andrew Siderowf, Luis Concha‐Marambio, David-Erick Lafontant, Carly M. Farris, Yihua Ma, Paula A. Urenia, Hieu Nguyen, Roy N. Alcalay, Lana M. Chahine, Tatiana Foroud, Douglas Galasko, Karl Kieburtz, Kalpana Merchant, Brit Mollenhauer, Kathleen L. Poston, John Seibyl, Tanya Simuni, Caroline M. Tanner, Daniel Weintraub, Aleksandar Videnović, Seung Ho Choi, Ryan Kurth, Chelsea Caspell‐Garcia, Christopher S. Coffey, Mark Frasier, Luís M. A. Oliveira, Samantha J. Hutten, Todd Sherer, Kenneth Marek, Claudio Soto