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Forest plot for the effect of nitrate supplementation on (A) plasma nitrate (µM) and (B) plasma nitrite (nM) levels in patients with chronic obstructive pulmonary disease. (1) sodium nitrate (8 mmol); (2) beetroot juice (BRJ) (7.58 mmol); (3) BRJ (12.9 mmol); (4) 140 mL of BRJ + 200 mL black currant cordial; (5) BRJ (6.75 mmol).
