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Figure 2 Bar graphs showing the beneficial effects of short-term external counterpulsation (ECP) before (open bars) and after (closed bars) two months of treatment on (A) mean Canadian Cardiovascular Society (CCS) angina class, and (B) mean number of daily sublingual nitroglycerin tablets consumed in the ECP group (n = 20), compared with no significant change in the control group (n = 20) (C and D). Data are expressed as mean ± SD.