To determine the efficacy of nebulized 5% hypertonic saline on cough severity and quality of life, in children with non-CF CSLD. Secondary Aims: To determine the: 1. Efficacy of nebulized 5% hypertonic saline on airway microbiome, pulmonary exacerbation rate, healthcare utilization, and rescue antibiotics. 2. Efficacy of nebulized 5% hypertonic saline on lung function 3. Adverse effects of nebulized 5% hypertonic saline in children
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Change in the Short Parent-proxy cough quality of life (PC-QOL) score
Timeframe: at -1 month of randomization, at day 1 of randomization, at 3 months of use of study drug
Change in the Chronic Cough-specific QoL(CC-QOL) score
Timeframe: at -1 month of randomization, at day 1 of randomization, at 3 months of use of study drug