Statistics
Analyses for the PIP levels and airway lumen scores were performed using One-way ANOVA of the MedCalc statistical software (version 19.3.1, MedCalc Software Ltd, Acacialaan 22, 8400 Ostend, Belgium). Analyses for the numbers of detected lesion were done using chi-square test and post hoc Bonferroni correction. Statistical differences were considered significant at p < 0.05.