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  Indian J Med Microbiol
 

Figure 2: Triggers of 54% of patients on the basis of history, the most common being air pollution (48%) followed by cold exposure (20%), physical activity (12%), irritants (9%), smoke (7%), and fumes and odors (4%)

Figure 2: Triggers of 54% of patients on the basis of history, the most common being air pollution (48%) followed by cold exposure (20%), physical activity (12%), irritants (9%), smoke (7%), and fumes and odors (4%)