Funding for this research was provided by:
Science and Technology Commission of Shanghai Municipality (19411960300)
Shanghai Municipal Health Commission (2019SY002)
Shanghai Hospital Development Center (SHDC12019113)
Shanghai Municipality: Shanghai Outstanding Academic Leaders Plan (Year 2019)
Received: 16 December 2021
Accepted: 9 March 2022
First Online: 28 March 2022
: The study was approved by Ethics Committee of Shanghai First Maternity and Infant Hospital (No. KS21208). All patients gave written informed consent to academic use of their medical records at the time of admission. All records were anonymized before data analysis.
: Not applicable.
: The authors declare that they have no competing interests.