Adrenal Cortex Hormones 1 Adult 1 Article 1 Asthma 1 Exhalation 1 Fractional Exhaled Nitric Oxide Testing Humans 1 Nitric Oxide 1 adult 1 aged 1 asthma 1 clinical article 1 corticosteroid 1 disease management 1 exhalation 1 female 1 fractional exhaled nitric oxide 1 fractional exhaled nitric oxide test 1 health care personnel 1 human 1 job experience 1 male 1 nitric oxide 1 patient education 1 patient empowerment 1 primary medical care 1 qualitative research 1 telephone interview 1