Funding for this research was provided by:
National Nature Science Foundation of China (U1611461)
National Nature Science Foundation of China (61672241)
National Nature Science Foundation of China (61602184)
National Nature Science Foundation of China (61528204)
Cultivation Project of Major Basic Research of NSF-Guangdong Province (2016A030308013)
Science and Technology Program of Guangzhou (201707010147)
Article History
Received: 25 August 2016
Accepted: 5 January 2018
First Online: 19 January 2018
Compliance with ethical standards
:
: Tangquan Qi, Yong Xu and Haibin Ling state that there are no conflicts of interest.