title: Biomarker research in Parkinson's disease: objective measures needed for patient stratification in future cause-directed trials.
authors.affiliation: Division of Neuroscience-OHRI, University of Ottawa, 451 Smyth Road, RGH #1412, Ottawa, ON, K1H 8M5, Canada. mschlossmacher@ohri.ca
authors.forename: Michael G
authors.initials: MG
authors.lastname: Schlossmacher
authors.forename: Brit
authors.initials: B
authors.lastname: Mollenhauer