Articles Parkinson Symptoms and Health Related Quality of Life as Predictors of Costs: A Longitudinal Observational Study with Linear Mixed Model Analysis Authors: Martinez-Martín P, Rodriguez-Blazquez C, Paz S , Forjaz MJ, Frades-Payo B, Cubo E, de Pedro-Cuesta J, Lizán L behalf ELEP Group Journal: Plos One Reference: PLoS One. 2015 Dec 23;10(12) Outside URL