00357nas a2200121   4500000000100000008004100001100001600042700001700058245013400075300000600209490000600215022001400221       2001                            d1 aF. de Abajo1 aL. Rodriguez00aRisk of upper gastrointestinal bleeding and perforation associated with low-dose aspirin as plain and enteric-coated formulations  a10 v1  a1472-6904