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The flowchart of this clinical study. We explained this clinical study in detail using brochure for 643 students who intended to take part in our clinical study and visited the room. We got the consent forms adequately signed by 640 students. In order to investigate the prevalence of asthma symptoms, we analyzed the information obtained from the ECRHS questionnaire and FENO data in 584 students whose ages were from 18 to 24.
