title: Erratum to: Is cognitive stability in Parkinson's disease a predictable phenomenon? A 5-year follow-up study.
authors.affiliation: Department of Neurology and Psychiatry, University of Rome "Sapienza", C.I.M.S. Centro Interdipartimentale Malattie Sociali, Rome, Italy.
authors.forename: Maria Elena
authors.initials: ME
authors.lastname: Di Battista
authors.affiliation: Department of Neurology and Psychiatry, University of Rome "Sapienza", C.I.M.S. Centro Interdipartimentale Malattie Sociali, Rome, Italy.
authors.forename: Alfonso
authors.initials: A
authors.lastname: Rubino
authors.affiliation: Department of Neurology and Psychiatry, University of Rome "Sapienza", C.I.M.S. Centro Interdipartimentale Malattie Sociali, Rome, Italy.
authors.forename: Marcella
authors.initials: M
authors.lastname: Valente
authors.affiliation: Department of Neurology and Psychiatry, University of Rome "Sapienza", C.I.M.S. Centro Interdipartimentale Malattie Sociali, Rome, Italy.
authors.forename: Patrizia
authors.initials: P
authors.lastname: Giustini
authors.affiliation: National Centre of Epidemiology, National Institute of Health, Rome, Italy.
authors.forename: Nicola
authors.initials: N
authors.lastname: Vanacore
authors.affiliation: Department of Neurology and Psychiatry, University of Rome "Sapienza", C.I.M.S. Centro Interdipartimentale Malattie Sociali, Rome, Italy. giuseppe.meco@uniroma1.it.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Meco