Article History
Received: 2 December 2019
Accepted: 30 January 2020
First Online: 21 February 2020
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: The study was designed by Wenhui Shi and Shanlu Shao. The experiments were performed by Shanlu Shao, Lin Lin, and Wenhui Shi. Wenhui Shi analyzed the data and co-wrote the manuscript with Lin Lin. Yeqing Ying supervised the study, helped design the experiments and write the paper. Anguo He participated in data collection and analysis.
: The datasets generated and/or analyzed during this study are available from the first author (Wenhui Shi, shiwenhui2008@163.com) and the corresponding author (Yeqing Ying, yeqing@zafu.edu.cn) on reasonable request.