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Effects of N-acetylcysteine (▒) and placebo (░) on vital capacity (VC) and diffusing capacity of the lung for carbon monoxide (DL,CO) depending on baseline composite physiological index (BL-CPI) being lower or higher than 50 points. #: p = 0.0031; ¶: p = 0.0015; +: p = 0.067. Reproduced from [19] with permission from BioMed Central.
