Funding for this research was provided by:
National Social Science Foundation of China (14BTQ036)
Text and Data Mining valid from 2020-02-03
Received: 13 August 2018
Accepted: 28 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: For all studies mentioned in this manuscript, no approval of the ethical review board was needed according to “Ethical Review Involving Human Biomedical Research” (No.11 Order of National Health and Family Planning Commission of China, ExternalRef removed 2017/content_ 5227817. html); only human subject research with a high impact for patients have to be reviewed.
: Not applicable.
: The authors declare that they have no competing interests.