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Methodological Challenges and their Empirical Background Maria Łuszczyńska COSMIN methodology for assessing the content validity of PROMs: user manual. for assessing the content validity of PROMs. 2017. cosmin.nl/wp-content/uploads/ COSMIN-methodology-for-content-validity-user-manual-v1. pdf.Each validation of the PROMS French version has been evaluated using the relevant items according to the instructions of the COSMIN group. L. B, "COSMIN methodology for assessing the content validity of PROMs– user manual," Amsterdam: VU University Medical Center, 2018. [26] Terwee.