1. Volume 150, Issue 7, Pages 1561-1567.e1 (June 2016)
Association Between Long-term Oral Contraceptive Use and Risk of Crohn’s Disease Complications in a Nationwide Study 
Hamed Khalili, Fredrik Granath, Karin E. Smedby, Anders Ekbom, Martin Neovius, Andrew T. Chan, Ola Olen 
Gastroenterology 
Volume 150, Issue 7, Pages e1 (June 2016)
DOI: /j.gastro
Copyright © 2016 AGA Institute Terms and Conditions

2. Figure 1 Type of oral contraceptive use and risk of surgery.
Gastroenterology  , e1DOI: ( /j.gastro )
Copyright © 2016 AGA Institute Terms and Conditions