Funding for this research was provided by:
National Natural Science Foundation of China (31570042, 31670063, 31870052)
National Key R&D Program of China (2018YFC1406703, 2018YFC0310704)
Taishan Scholars Program of Shandong Province (tspd20181203)
Science and Technology Basic Resources Investigation Program of China (2017FY100804)
Text and Data Mining valid from 2019-11-14
Received: 15 July 2019
Accepted: 2 October 2019
First Online: 14 November 2019
Compliance with ethical standards
: The authors have declared that no conflict of interest exists.
: This article does not contain any studies with human participants or animals performed by any of the authors.