Fig. 1From: Typical antipsychotics is associated with increased risk of severe exacerbation in asthma patients: a nationwide population-based cohort studyAlgorithm for subject enrollment and timeline for case crossover study. a Inclusion algorithm for severe asthma exacerbation; b timeline for the case and control periods. COPD, chronic obstructive pulmonary disease; ED, emergency departmentBack to article page