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Patient Determined Disease Steps (PDDS) (Hohol MJ, Orav EJ, Weiner HL. Disease Steps in multiple sclerosis: A simple approach to evaluate disease progression. Neurology 1995; 45: 251-55). (Hohol MJ, Orav EJ, Weiner HL. Disease Steps in multiple sclerosis: a longitudinal study comparing disease steps and EDSS to evaluate disease progression. Multiple Sclerosis 1999; 5: 349-54). (Marrie RA and Goldman M. Validity of performance scales for disability assessment in multiple sclerosis. Multiple Sclerosis 2007; 13: 1176-1182). (The PDDS and/or PS are provided for use by the NARCOMS Registry: www.narcoms.org/pdds. NARCOMS is supported in part by the Consortium of Multiple Sclerosis Centers (CMSC) and the CMSC Foundation).
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