00439nas a2200121   4500000000100000008004100001100012700042700001500169700001500184245010000199300001100299490000700310       1999                            d1 aWorld Health Organisation International Society of Hypertension Blood Pressure Lowering Treatment Trialists' Collaboration1 aNeal Bruce1 aMacmahon S00aAn overview of 37 randomised trials of blood pressure lowering agents among 270,000 individuals  a517-290 v21