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Some flavorings include the chemical diacetyl, which has been linked to cases of bronchiolitis

Functional area refers to different aspects of life such as private social contacts, job, etc

Causes can include damage to the nerves and receptors in the nose, nasal cavity, or brain

Some other studies focus on the variations of genes within the context of tobacco smoking and detected the associations between smoke exposure and CTFR dysfunction [117, 118], which could in turn lead to deleterious effects on airway surface liquid secretion, enhanced mucus expression, reduced mucociliary clearance, chronic bacterial infection, and excess inflammation [119], rendering the main morbidity and mortality in CF patients because of the fact that lung inflammation and chronic respiratory infections alone account for nearly 95% of the morbidity and mortality in patients with CF [120]