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. 2016 Oct 7;95(40):e4888. doi: 10.1097/MD.0000000000004888

Figure 2.

Figure 2

Flowchart of the studied population. COPD = chronic obstructive pulmonary disease, OPD = others pulmonary diseases including pulmonary fibrosis, pulmonary hypertension, infiltrative disease, and emphysema, OSAS = obstructive sleep apnea syndrome.