Wang, Jing
Wang, Jian-qiang
Ma, Yin-xiang
Funding for this research was provided by:
National Natural Science Foundation of China (71571193)
Article History
Received: 26 October 2015
Accepted: 1 June 2020
First Online: 30 July 2020
Compliance with Ethical Standards
: All the authors have read and abided by the statement of ethical standards for manuscripts. We declare that (a) The material has not been published in whole or in part elsewhere; (b) The paper is not currently being considered for publication elsewhere; (c) All authors have been personally and actively involved in substantive work leading to the manuscript, and will hold themselves jointly and individually responsible for its content; (d) Authors whose names appear on the submission have contributed sufficiently to the scientific work and, therefore, share collective responsibility and accountability for the results; (e) All sources of funding of all the authors that may be relevant, including current funding of posts and funding for the research, are being reported; (f) There are no conflicts of interest.