Factors Affecting the Extrusion Rate and Complications After Ventilation Tube Insertion: A Multicenter Registry Study on the Effectiveness of Ventilation Tube Insertion in Pediatric Patients With Chronic Otitis Media With Effusion-Part II.

"No potential conflict of interest relevant to this article was reported."

"This work was supported by the Otitis Media Research Project funded by the Korean Otologic Society, Seoul, Republic of Korea and a National Research Foundation of Korea (NRF) grant funded by the Korean government (Ministry of Science and ICT) (No. 2022R1C1C1010262). AUTHOR CONTRIBUTIONS: Conceptualization: JC, JWC, HJP, KYL. Data curation: MHY, YSC, JC, JHC, GCH, BCJ, ISM, SHL, JR, SGY. Formal analysis: MHY, JC, JWC, KYL, JHS. Funding acquisition: YSC, YHC, JWC, JHL, SGY. Methodology: MHY, JHC, GCH, BCJ, DKK. Project administration: MHY, JC, JWC, GCH, SHL. Visualization: MHY, BCJ, DKK, KSK, JHL, ISM, HJP, SNP, JHS, SGY. Writing–original draft: MHY, JWC. Writing–review & editing: YSC, JC, YHC, JHC, JWC, GCH, BCJ, DKK, KSK, JHL, KYL, SHL, ISM, HJP, SNP, JR, JHS, SGY."

"The study protocol was reviewed and approved by the Institutional Review Boards of all participating hospitals. This protocol was registered with the Clinical Research Information Service (http://cris.nih.go.kr, No. KCT0001378) for public access. Written informed consent was obtained from all parents/guardians and children aged >7 years. Data were registered at each hospital using Internet-based electronic case report forms (eCRFs; http://otology.crf.kr)."