Funding for this research was provided by:
National Natural Science Foundation of China (11175221, 51071079, 51302120, 51472111)
Natural Science Foundation of Gansu Province (145RJZA226)
IDENTIFIERS
PEER REVIEW METHOD
: Single-blind
PUBLICATION HISTORY
: Received 28 November 2017; Accepted 19 December 2017; Accepted Manuscript published 19 December 2017; Advance Article published 11 January 2018; Version of Record published 25 January 2018