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Authors
Zheng, Xue-yan
Yi, Qian
Xu, Xiao-jun
Meng, Rui-lin
Ma, Shu-li
Tang, Si-li
Xu, Hao-feng
Xu, Ying-shan
Xu, Yan-jun
Yang, Yi
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Article History
Received: 19 December 2020
Accepted: 17 September 2021
First Online: 7 December 2021
Declarations
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: The study was approved by Ethical Review Committee of NCNCD, Guangdong CDC. Informed consent was obtained from a parent or legal guardian. All methods were carried out in accordance with relevant guidelines and regulation.
: Not applicable.
: The authors declare that they have no competing interests.
