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Kalkers, Nynke F; Galan, Ingrid; Kerbrat, Anne; Tacchino, Andrea; Kamm, Christian P.; O'Connell, Karen; McGuigan, Chris; Edan, Gilles; Montalban, Xavier; Uitdehaag, Bernard Mj; Mokkink, Lidwine B (2021). Differential item functioning of the Arm function in Multiple Sclerosis Questionnaire (AMSQ) by language, a study in six countries. Multiple sclerosis journal, 27(1), pp. 90-96. Sage 10.1177/1352458519895450