title: Re: Declines in the diagnosis of primary progressive MS-A critical change in phenotype or critical measurement error?
authors.affiliation: 1 Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
authors.forename: Helga
authors.initials: H
authors.lastname: Westerlind
authors.affiliation: 2 Department of Clinical Neuroscience (CNS), Karolinska Institutet, Stockholm, Sweden.
authors.forename: Leszek
authors.initials: L
authors.lastname: Stawiarz
authors.affiliation: 2 Department of Clinical Neuroscience (CNS), Karolinska Institutet, Stockholm, Sweden.|3 Department of Neurology, Karolinska University Hospital, Huddinge, Sweden.
authors.forename: Katharina
authors.initials: K
authors.lastname: Fink
authors.affiliation: 2 Department of Clinical Neuroscience (CNS), Karolinska Institutet, Stockholm, Sweden.|3 Department of Neurology, Karolinska University Hospital, Huddinge, Sweden.
authors.forename: Jan
authors.initials: J
authors.lastname: Hillert
authors.affiliation: 2 Department of Clinical Neuroscience (CNS), Karolinska Institutet, Stockholm, Sweden.
authors.forename: Ali
authors.initials: A
authors.lastname: Manouchehrinia
mesh_terms: D006801:Humans; D009103:Multiple Sclerosis; D020528:Multiple Sclerosis, Chronic Progressive; D010641:Phenotype