title: Problems associated with fluid biomarkers for Parkinson's disease.
authors.affiliation: Institute of Neuroscience &amp; Physiology, Department of Psychiatry &amp; Neurochemistry, Sahlgrenska Academy at the University of Gothenburg, M&#x00F6;lndal, Sweden.
authors.forename: Jakob
authors.initials: J
authors.lastname: Nyhlén
authors.forename: Radu
authors.initials: R
authors.lastname: Constantinescu
authors.forename: Henrik
authors.initials: H
authors.lastname: Zetterberg