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. 2016 Oct 9;2:2055217316673235. doi: 10.1177/2055217316673235

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© The Author(s) 2016

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 3.0 License (http://www.creativecommons.org/licenses/by-nc/3.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — (b) Graded response model person-item threshold distribution for Multiple Sclerosis Impact Scale (MSIS)-29v1. (a) Physical impact subscale and (b) psychological impact subscale—Week 52.