Zhao, Jun
Geng, Lijiao
Chen, Yong
Wu, Chunfang
Text and Data Mining valid from 2020-01-06
Version of Record valid from 2020-01-06
Article History
Received: 24 May 2019
Accepted: 9 December 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: All procedures performed in studies were in accordance with the ethical standards of the national research committee and with the Helsinki declaration and its later amendments or comparable ethical standards.
: Not applicable.
: The authors declare that they have no competing interests.