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. 2014 Jul 16;16(8):561–568. doi: 10.1111/jch.12354

Figure 1.

Figure 1

Number of articles at each step of systematic review beginning with miscellaneous sources, the Cochrane Registry of Randomized Trials, and the PubMed database leading to 13 blood pressure (BP) difference trials and 8 drug comparison trials published from January 1, 2008, to December 31, 2013. These were added to the trials from the systematic review by Law and colleagues,9 which covered trials published from 1967 to December 31, 2007, to yield 121 BP difference trials and 54 drug comparison trials for review.