Zhang, Jian
Yao, Liang
Peng, Shaopeng
Fang, Yuan
Tang, Ruitian
Liu, Jianxiong http://orcid.org/0000-0001-5489-7851
Article History
Received: 24 February 2018
Revised: 11 July 2018
Accepted: 16 July 2018
First Online: 3 August 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Ethical approval is not applicable as this is a meta-analysis.
: For this type of study, formal consent is not required.