Fig. 2From: Burden of asthma and COPD overlap (ACO) in Taiwan: a nationwide population-based studyDiagram of the four cohorts identified in the study. *Patients with claims for both COPD and asthma not meeting any of four pre-defined criteria for ACO. ACO, asthma-COPD overlap; COPD, chronic obstructive pulmonary diseaseBack to article page