title: Primary and secondary progressive MS have a similar age at onset of progression - Commentary.
authors.affiliation: Departments of Clinical Neurosciences and Community Health Sciences, University of Calgary, Calgary, AB, Canada.
authors.forename: Marcus
authors.initials: M
authors.lastname: Koch
mesh_terms: D017668:Age of Onset; D018450:Disease Progression; D006801:Humans; D020528:Multiple Sclerosis, Chronic Progressive