Funding for this research was provided by:
Natural Science Foundation of Heilongjiang Province of China (ZD2017017)
Science Foundation of Heilongjiang Academy of Medical Science (Grant No. 201811)
Article History
Received: 1 October 2018
Accepted: 6 May 2019
First Online: 13 May 2019
Compliance with ethical standards
:
: All authors declare no conflict of interest.