Phillips W, Piller LB, Williamson JD, Whittle J, Jafri SZ, Ford CE, Einhorn PT, Oparil S, Furberg CD, Grimm RH, Alderman MH, Davis BR, Probstfield JL. Risk of hospitalized gastrointestinal bleeding in persons randomized to diuretic, ACE-inhibitor, or calcium-channel blocker in ALLHAT. J Clin Hypertens (Greenwich). 2013 Nov; 15(11):825-32.