Article History
Received: 2 September 2021
Accepted: 11 January 2022
First Online: 21 January 2022
Declarations
:
: The study was approved by the Ethics Committee of the Affiliated Wuxi Maternity and Child Health Care Hospital of Nanjing Medical University (protocol code 2021–06-0615–11). Verbal informed consent was obtained from participants, which was documented in an Excel file and saved with a security code. The Ethics Committee approved the procedure for verbal consent of our study, and the Department of Education and Science permitted the access and use of the medical records described in our study.
: Not applicable.
: The authors declare that they have no competing interests.