Liu, Dong
Chen, Dongzhen
Brown, B. Bradford
Article History
Received: 31 March 2019
Accepted: 17 October 2019
First Online: 12 November 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: Because the research is a literature review and did not involve collection of data from human research participants, it was classified as exempt and did not require further approval of an ethical committee was not necessary.
: This research is a meta-analysis (secondary data analysis); it did not involve informed consent of human research participants.