Text and Data Mining valid from 2019-05-02
Received: 29 January 2019
Accepted: 28 March 2019
First Online: 2 May 2019
Ethics approval and consent to participate
: This research, including the procedures and protocols of specimen collection and processing, was reviewed and approved by the Ethics Committee of Qingdao Agricultural University.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.