Clinical epidemiology and disease burden of bronchiolitis in hospitalized children in China: a national cross-sectional study.

"Declarations Ethical approvalThis study was approved by the Ethics Committee of Beijing Children's Hospital, Capital Medical University (approval number: 2022-E-064-R). The requirement for informed consent from patients was waived because the analysis only involved a retrospective analysis of pooled data from medical records. Our data were completely deidentified and anonymized to protect privacy. Conflict of interestNo financial or non-financial benefits have been received or will be received from any party related directly or indirectly to the subject of this article. The authors have no conflict of interest to declare. Conflict of interest No financial or non-financial benefits have been received or will be received from any party related directly or indirectly to the subject of this article. The authors have no conflict of interest to declare."

"Funding XZD was supported by the CAMS Innovation Fund for Medical Sciences (2019-I2M-5-026) and the National Major Science & Technology Project (2017ZX10103004-004)."