@misc{9387,
  author = {C. Crooks and J. West and T. Card},
  title = {Comorbidities affect risk of nonvariceal upper gastrointestinal bleeding},
  year = {2013},
  journal = {Gastroenterology},
  volume = {144},
  number = {7},
  pages = {1384-93},
  issn = {0016-5085},
  doi = {10.1053/j.gastro.2013.02.040},
}