1. Fahy JV, Dickey BF. Airway mucus function and dysfunction [J]. N Engl J Med, 2010,363(23):2233-2247.
2. Donaldson SH, Bennett WD, Zeman KL, et al. Mucus clearance and lung function in cystic fibrosis with hypertonic saline[ J]. N Engl J Med,2006,354(3) :241-250.
3. Crawford B, Monz B, Hohlfeld J, et al. Development and validation of a cough and sputum assessment questionnaire [ J ]. Respir Med, 2008,102 (11) : 1545-1555.