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Forest plot of the standardized mean difference (SMD) in nasal nitric oxide (nNO) levels among cases and control subjects. Panel A: nNO in patients with chronic rhinosinusitis with nasal polyps (CRSwNP) and healthy controls; Panel B: nNO in patients with chronic rhinosinusitis without nasal polyps (CRSsNP) and healthy controls; Panel C: nNO in CRSwNP and CRSsNP patients.
