Funding for this research was provided by:
Shanghai Municipal Health and Family Planning Commission (201640213)
Received: 3 March 2020
Accepted: 29 June 2020
First Online: 6 July 2020
Ethics approval and consent to participate
: Approval for this study was obtained from Ethics Committee of The First Affiliated Hospital of Soochow University. The written informed consents were acquired from the patients or their family members.
: Not applicable
: The authors declare that they have no competing interests.