00382nas a2200133   4500000000100000008004100001100001400042700001200056700001200068245013900080300000800219490000700227022001400234       2012                            d1 aC. Crooks1 aT. Card1 aJ. West00aDefining upper gastrointestinal bleeding from linked primary and secondary care data and the effect on occurrence and 28 day mortality  a3920 v12  a1472-6963