Lu, Yaheng
Chen, Tingting
Wen, Yizhou
Si, Feifei
Wu, Xindan
Yang, Yanfeng
Article History
Received: 27 April 2021
Accepted: 2 September 2021
First Online: 16 September 2021
Declarations
:
: This retrospective study is approved by the Ethics Committee of Chengdu Women’s and Children’s Central Hospital, School of Medicine, UESTC, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Due to the retrospective nature of the study, informed consent was waived.
: Not Applicable.
: The authors declare that they have no conflict of interest.