Funding for this research was provided by:
Harbin Medical University (ywh201512, HYDSYJQ201602)
Received: 21 January 2020
Accepted: 31 March 2020
First Online: 15 April 2020
Ethics approval and consent to participate
: Specimen collection and analysis processes were approved by the Ethics Committee of The Fourth Affiliated Hospital of Harbin Medical University.
: Not applicable.
: The authors declare that they have no competing interests.