Liu, Yuan
Zeng, Yi
Zeng, Junfeng
Li, Mingyang
Wei, Wenxing
Shen, Bin http://orcid.org/0000-0002-9632-7221
Article History
Received: 22 March 2019
Accepted: 29 May 2019
First Online: 29 June 2019
Ethics approval and consent to participate
: Ethical approval is not necessary because it is a comment on previously published articles and does not involve the handling of any personal patient data.
: The authors declare that they have no competing interests.