00338nas a2200145   4500000000100000000000100001008004100002100001400043700001200057700001200069245007700081300001200158490000800170022001400178       2013                            d1 aC. Crooks1 aJ. West1 aT. Card00aComorbidities affect risk of nonvariceal upper gastrointestinal bleeding  a1384-930 v144  a0016-5085