Funding for this research was provided by:
China Postdoctoral Science Foundation (2021)
Article History
Received: 7 July 2020
Accepted: 10 June 2021
First Online: 15 July 2021
Declarations
:
: This study was approved by the Ethics Committee of the Shanghai First Maternity and Infant Hospital. Date of approving: Jun 13, 2018. Ethical acceptance number: (2018) No. (35). All participants were over 16 years old. Due to the retrospective nature of this analysis and the fact that the data was part of the medical history, informed consent for participants included was waived by the ethics committee on the condition that all data were anonymized. Besides, the dissemination of the study findings does not refer to specific objects but the general source population. The team obtained permission from the Shanghai First Maternity and Infant Hospital to access the data used in this research.
: Not applicable.
: The authors declare that they have no competing interests.