Funding for this research was provided by:
National Key Research & Development Program (2016YFC1000200, 2018YFC1004200)
the State Key Program of National Natural Science Foundation of China (81830100, 31530047, 81730041)
Received: 17 February 2020
Accepted: 29 July 2020
First Online: 21 August 2020
Ethics approval and consent to participate
: This study was performed in accordance with guidelines outlined in the Declaration of Helsinki. All methods and information collection protocols were approved by the institutional review board of Nanjing Medical University, China NJMUIRB (2018) 009. Our research has obtained the waiver from institutional review board for the medical record review for selective variable analysis in three centers.
: Not applicable.
: The authors declare that they have no competing interests.