Zou, Xing
Li, Yongguo
Wei, Zehong
Wang, Ting
Hu, Yue
Zhu, Ying
Li, Jianbo
Tang, Renkuan
Article History
Received: 21 July 2017
Accepted: 30 August 2017
First Online: 2 September 2017
Compliance with ethical standards
: This study was subject to approval by the Ethics Committee of Chongqing Medical University.
: The authors declare that they have no conflicts of interest.