Zou, Da
Ye, Kaifeng
Tian, Yun
Li, Weishi
Zhou, Fang
Zhang, Zhishan
Lu, Zhengyang
Xu, Zhongning
Article History
Received: 24 November 2019
Revised: 25 February 2020
Accepted: 3 March 2020
First Online: 10 March 2020
Compliance with ethical standards
:
: None of the authors has any conflicts of interest to declare.
: 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.