Zhang, Yanfang
Guo, Tongsheng
Yang, Funing
Mao, Yuanli
Li, Liubing
Liu, Chenxi
Sun, Qiang
Li, Yongzhe
Huang, Jing
Article History
Received: 7 March 2018
Accepted: 21 July 2018
First Online: 21 August 2018
Compliance with ethical standards
:
: Yanfang Zhang, Tongsheng Guo, Funing Yang, Yuanli Mao, Liubing Li, Chenxi Liu, Qiang Sun, Yongzhe Li, and Jing Huang declare no conflict of interest.
: The study followed the rules of the ethical committees of four participating centers.
: All participants in this study gave informed consent prior to enrollment.