Funding for this research was provided by:
National Natural Science Foundation of China (91332107, 81371407, 81430022)
Text and Data Mining valid from 2019-07-31
Received: 27 May 2019
Accepted: 16 July 2019
First Online: 31 July 2019
Ethics approval and consent to participate
: This review does not involve the use of any animal or human data or tissue, or any individual person’s data. Ethics approval and consent for publication are not applicable.
: This review does not contain any individual person’s data in any form. Thus there is no need of consent for publication obtained from individual person, or legal guardian.
: The authors declare that they have no competing interests.