Zou, Da
Li, Weishi
Deng, Chao
Du, Guohong
Xu, Nanfang
Article History
Received: 19 March 2018
Revised: 1 August 2018
Accepted: 19 September 2018
First Online: 10 October 2018
Compliance with ethical standards
:
: The authors declared that they have no conflict of interest.
: All data collection and analysis conducted in this study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.