Tian, Lei
Zhang, Zhen
Sun, Ziyong
Funding for this research was provided by:
the National Mega Project on Major Infectious Disease Prevention (2017ZX10103005-007)
Article History
Received: 21 February 2019
Accepted: 21 May 2019
First Online: 28 May 2019
Ethics approval and consent to participate
: The study protocol was approved by the Tongji Hospital ethics committee for research in health. The Tongji Hospital ethics committee also approved the waiver of informed consent to participate in this study due to its retrospective design. All patient data were anonymous prior to the analysis.
: Not applicable.
: The authors declare that they have no competing interest.