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. 2017 Dec 11;17:186. doi: 10.1186/s12890-017-0535-y

Fig. 7.

Fig. 7

Changes in peak expiratory flow values, expressed as L/min; comparison of best and worst values obtained during morphine and 0,9% NaCl periods. MCID, Minimal Clinically Important Difference [25]; PEF, Peak Expiratory Flow