Funding for this research was provided by:
the Program of Yunling Scholar
the Youth Innovation Promotion Association (2013252)
the Applied Basic Research Programs of Yunnan Province (2017FB137)
Article History
Received: 23 April 2019
Accepted: 22 May 2019
First Online: 7 June 2019
Compliance with Ethical Standards
:
: These authors have no conflict of interest to declare.