Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleNon-linearity of Parkinson's disease progression: implications for sample size calculations in clinical trials.AuthorsGuimaraes P; Kieburtz K; Goetz CG; Elm JJ; Palesch YY; Huang P; Ravina B; Tanner CM; Tilley BCPublicationClinical trials (London, England), 2005, Vol 2, Issue 6, p509ISSN1740-7745Publication typearticleDOI10.1191/1740774505cn125oa