Funding for this research was provided by:
Natural Science Foundation of Xinjiang Province (2013211A073)
Received: 30 June 2019
Accepted: 9 September 2019
First Online: 16 September 2019
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Not applicable.
: The authors declare that they have no competing interests.