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Figure 1 Percent change in forearm blood volume in response to 0.6 mg sublingual nitroglycerin (GTN) in the three groups. *p < 0.05 compared with GTN group, analysis of covariance.  p < 0.05 compared with before randomization, paired t test; p = NS before randomization versus after chronic administration for control and pentaerythritol tetranitrate (PETN) groups, paired t test. Open bar = before randomization; closed bar = after chronic administration.
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