Funding for this research was provided by:
National Natural Science Foundation of China (81571367)
Shandong Key Research and Development Program (2016GSF201082)
Article History
Received: 25 January 2019
Accepted: 29 May 2019
First Online: 3 June 2019
Compliance with ethical standards
:
: Jin bin, Yang Jinhuan, Du Gang, Shi Binyao, and Ma Huan have no conflicts of interest or financial ties to disclose.