Funding for this research was provided by:
the National Natural Sciences Foundational of China (no.30972191)
the 948 Program from Ministry of Agriculture of China (no.2014Z34)
Text and Data Mining valid from 2018-07-21
Received: 17 May 2018
Accepted: 13 July 2018
First Online: 21 July 2018
Compliance with Ethical Standards
: This study was approved by the Ethics Committee of Jilin Agricultural University with ID no. 20121008. All subjects signed their informed consents before participation.
: The authors declare that they have no conflict of interest.