Liu, Yusheng
Qiao, Lingyan
Wu, Xiongwei
Jiang, Zhong
Hao, Xiwei
Article History
Received: 26 May 2021
Accepted: 25 October 2021
First Online: 3 January 2022
Declarations
:
: The study was performed according to the World Medical Association Declaration of Helsinki, and This study was approved by the Ethics Committee of The Affiliated Hospital of Qingdao University (Project identification code: QDFY-KY-2021-012). Given the retrospective nature of this study, the ethics committee approved the waiver of parents’ written consent. The waiver will not adversely affect the rights and welfare of the patients and all data relating to patients are kept anonymized.
: Not applicable.
: The authors declare that they have no competing interest.