Fig. 1From: Soluble RAGE in COPD, with or without coexisting obstructive sleep apnoeaStudy flowchart. Numbers of participants who were screened, assigned to a study group, and included in the analyses after 1-year follow-up according to treatment. OSA obstructive sleep apnoea, COPD chronic obstructive pulmonary disease, CPAP continuous positive airway pressureBack to article page