Zhao, Tingting
Long, Wei
Lu, Peng
Funding for this research was provided by:
National Natural Science Foundation of China (41305132)
Article History
Received: 4 March 2022
Accepted: 21 June 2022
First Online: 4 July 2022
Declarations
:
: The data used in this study were collected for administrative purposes without any individual identifiers. This study was approved by the Institutional Review Board of Nanjing Maternity and Child Health Care Hospital (2020-KY-043), and the methods were carried out in accordance with the approved guidelines.
: NA; the data used in this study were collected for administrative purposes without any individual identifiers.
: We declare no competing interests.