@article {LOGAN311, author = {R F A LOGAN}, title = {Smoking, use of oral contraceptives, and medical induction of remission were risk factors for relapse in Crohn{\textquoteright}s disease}, volume = {44}, number = {3}, pages = {311--312}, year = {1999}, doi = {10.1136/gut.44.3.311}, publisher = {BMJ Publishing Group}, issn = {0017-5749}, URL = {https://gut.bmj.com/content/44/3/311}, eprint = {https://gut.bmj.com/content/44/3/311.full.pdf}, journal = {Gut} }