Identification and treatment of persistent small airway dysfunction in paediatric patients with asthma: a retrospective cohort study.

"Declarations Ethics approval and consent to participateThis study was approved by the Ethics Committee of the Chongqing Youyoubaobei Women and Children’s Hospital (Number: YYBB-ER-2021004) and the Institutional Review Board of the Children’s Hospital of Chongqing Medical University [File No: 2023(156)]. The need for informed consent was waived by the ethics committee/Institutional Review Board of [Ethics Committee of the Chongqing Youyoubaobei Women and Children’s Hospital/Institutional Review Board of the Children’s Hospital of Chongqing Medical University], because of the retrospective nature of the study. All the procedures in this study were performed in accordance with the tenets of Declaration of Helsinki. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This work was supported by The Research and Cultivation Fund of Chongqing Youyoubaobei Women and Children’s Hospital (Grant No. 2021 YYRCF 02); and The National Natural Science Foundation of China (Grant No. 81670018). The funders of this study had no role in study design, data collection, data analysis, data interpretation, or writing of the report."