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This study used a retrospective cohort design. The study protocol had been checked and approved by the ethical committee of Children's Hospital of Nanjing Medical University (approval number: 201701010). All the children's information was processed anonymously, and the collected data were used only for this study.
Copyright and License information: ©2024 Chen, Chen, Zhang and Ling.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
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