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Frahm, Niklas, Ellenberger, David, Fneish, Firas, Christoph, Kleinschnitz, Warnke, Clemens, Zettl, Uwe K., Friedemann, Friedemann, Rauser, Benedict, Stahmann, Alexander, Vogelmann, Vroni and Flachenecker, Peter (2021). Characteristics of secondary progressive multiple sclerosis: Disease activity and provision of care in Germany - A registry-based/multicentric cohort study. Mult. Scler. Relat. Disord., 56. OXFORD: ELSEVIER SCI LTD. ISSN 2211-0356