Funding for this research was provided by:
the National Social Science Foundation of China (Grant number: 15BSH043)
Text and Data Mining valid from 2020-01-06
Received: 27 September 2019
Accepted: 23 December 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: The study is conducted in accordance with the ethical standards of the institutional and national research committees and with the 1964 Helsinki Declaration and its subsequent revisions or similar ethical standards. Each volunteer participant obtained a written informed consent based on inclusion criteria. Attendees were told that they could withdraw from the study at any time without any consequences and that the anonymity and confidentiality of the study were guaranteed.
: The authors give consent for publication of this paper in International Journal for Equity in Health.
: The authors declare that they have no conflict of interest.