00484nas a2200145   4500000000100000008004100001100001500042700008400057700001600141700001400157700001500171245013100186300001300317490000800330       2000                            d1 aCollins R.1 aPulmonary Embolism Prevention (PEP) Trial Collaborative Group Writing Committee1 aPrentice C.1 aRodgers A1 aMacmahon S00aPrevention of pulmonary embolism and deep vein thrombosis with low dose aspirin: the Pulmonary Embolism Prevention (PEP) Trial  a1294-3020 v355