The original version was independently translated forward (into Portuguese) by two bilingual translators (J.R., H.T.S.). The translations were reconciled to address discrepancies between the original forward independent translations. A single literal back translation (to English) was then performed by a Portuguese gastroenterology resident (J.R) who is a native language speaker with certified English proficiency. The original version and the back-translated version of the SIBDQ were compared and harmonised to ensure conceptual equivalence between the source and target language versions (J.R., H.T.S.). Moreover, a convenient sample of 5 Portuguese IBD patients evaluated the questionnaire in terms of interpretation/ease of comprehension and made their suggestions for improvement. Finally, a panel discussion with the project manager (J.R.) and bilingual experts in IBD (H.T.S. and F.M.) took place to check the final translation and to reformulate some items according to the cognitive debriefing of the 5 patients.

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