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Figure 2 Fluctuation of flow-mediated, endothelium-dependent vasodilation in 20 patients with variant angina (solid circles) and 20 control subjects (open circles). See text for details. *p < 0.01 by analysis of variance. 06:00 = 6 AM; 14:00 = 2 PM; 20:00 = 8 PM.
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