Limitations
Follow-up of all participants could not be completed due to the COVID
pandemic. A Uniform sequence of first doing IPFT and then doing
bronchoscopy could not be done in all patients as there are fixed days
for bronchoscopy to avoid discomfort to the patient (additional hospital
visit). However, the reporting IPFT and bronchoscopy were done without
knowing the results of other procedures. Controls were taken from a
birth cohort, and we didn’t perform bronchoscopy on them (gold standard
to diagnose airway anomaly). We could not do IPFT of children who had
normal bronchoscopy.