Funding for this research was provided by:
National Natural Science Foundation of China (C31671823)
National Natural Science Foundation of China (C31871752)
Shaanxi Normal University (GK201801002)
Shaanxi Normal University (GK201803074)
IDENTIFIERS
PEER REVIEW METHOD
: Single-blind
PUBLICATION HISTORY
: Received 2 April 2019; Accepted 28 May 2019; Version of Record published 4 June 2019