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Contributors SF: funding, conception, interpretation of results, manuscript writing and editing, approved the final version. PVL: design, data collection, data analysis, interpretation of results, manuscript editing, approved the final version. JF: assistance with data analysis, interpretation of results, manuscript editing, approved the final version. BMN: funding, conception, design, data collection, assistance with data analysis, interpretation of results, manuscript writing and editing, approved the final version.
Funding The study was supported by a Crohn's & Colitis Foundation of America (CCFA), Senior Research Award.
Competing interests None declared.
Ethics approval The study was approved by the Danish Data Protection Agency (j.nr. 2014-41-3466). According to Danish law, there are no ethical approvals of register-based studies necessary.
Provenance and peer review Not commissioned; internally peer reviewed.
▸ Additional material is published online only. To view, please visit the journal online (http://dx.doi.org/10.1136/gutjnl-2016-311805).