Ma, Rui
Zou, Lingyun
Article History
Received: 9 April 2021
Accepted: 31 January 2022
First Online: 16 February 2022
Declarations
:
: The study was performed in accordance with the Declaration of Helsinki and was approved by the Ethics Committee of Shenzhen Baoan Women’s and Children’s Hospital (approval ID: LLSC-2020-03-05). The requirement to obtain any informed consent was waived by the Ethics Committee of Shenzhen Baoan Women’s and Children’s Hospital, because only routine health data in the China Birth Registry System were used and the patients/the public were not involved in the design, conduct, reporting or dissemination plans of our research. Data collected were anonymous, and no individually identifiable information were available in the analysis.
: Not applicable.
: All authors report no competing interests.