Funding for this research was provided by:
International Cooperation Project with Russia (2015DFR31070)
Beijing municipal Administration of Hospitals Clinical Medicine Development of Special Funding Support (ZYLX201713)
Article History
Received: 8 January 2018
Accepted: 13 June 2018
First Online: 5 July 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants performed by any of the authors.