Funding for this research was provided by:
the Chongqing Research Program of Basic Research and Frontier Technology (Nos.cstc2015jcyjBX0019 and cstc2016jcyjA0145)
the Scientific Research Fund of Chongqing Municipal Education Commission (No.KJ1711268)
the Scientific Research Fund of Chongqing University of Arts and Sciences (Z2018RJ08)
Article History
Received: 27 June 2018
Accepted: 23 February 2019
First Online: 22 March 2019
Compliance with ethical standards
: All involved studies have been approved and performed in accordance with ethical standards.
: The authors declare that they have no conflict of interest.