Methods
This study involved a retrospective analysis of the clinical data, PFT
results and radiographic features of patients diagnosed with PIBO
between 2011 and 2019 at the First Hospital of Jilin University. The
study was approved by the research ethics committees of our
institutions. All tests were ordered as part of clinical care of
patients with PIBO. All participating patients and the parents or legal
guardians verbally consented to be included in the study.