<style face="normal" font="default" size="100%">Emerging trends and risk factors for perianal surgery in Crohn\textquoterights disease: a 20-year national population-based cohort study</style>

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31<style face="normal" font="default" size="100%">Emerging trends and risk factors for perianal surgery in Crohn\textquoterights disease: a 20-year national population-based cohort study</style><style face="normal" font="default" size="100%">Emerging trends and risk factors for perianal surgery in Crohn\textquoterights disease: a 20-year national population-based cohort study</style>