Funding for this research was provided by:
National Natural Science Foundation of China (81570528)
National 13th Five-Year Special Grand Project for Infectious Diseases of China (2016ZX10002007)
Text and Data Mining valid from 2019-05-17
Received: 12 April 2018
Accepted: 8 December 2018
First Online: 17 May 2019
Compliance with ethical standards
: The authors whose names are listed below certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria, educational grants, participation in speakers’ bureaus, membership, employment, consultancies, stock ownership, or other equity interest, and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript. We have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Human Research Ethics Committee from the First Affiliated Hospital of Xi’an Jiaotong University and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was received from all participants before the study.