Figure 1.

Flow diagram of the article screening and evaluation process. *“Other” included asthma–chronic obstructive pulmonary disease overlap syndrome (n = 5), letter (n = 4), erratum (n = 2), not English language (n = 2), and retracted publication (n = 1). ^†“Other” included cost-effectiveness modeling, letter, not patients with asthma, not English language, asthma phenotyping analysis, controlled trial, and retracted publication (each n = 1). ED = emergency department.