Funding for this research was provided by:
the National Mega Project on Major Infectious Disease Prevention (2017ZX10103005-007)
Received: 7 March 2018
Accepted: 21 February 2019
First Online: 7 March 2019
Ethics approval and consent to participate
: The study protocol was approved by the Tongji Hospital ethics committee for research in health. Informed written consent was obtained from the patient before inclusion in the study.
: Not applicable.
: the authors declare that they have no competing interests.
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