Jiao, Yang
Zhang, Zhan
Zhang, Ting
Shi, Wen
Zhu, Yan
Hu, Jie
Zhang, Qin
Article History
Received: 8 August 2019
Accepted: 13 February 2020
First Online: 16 July 2020
Compliance with ethics guidelines
: Yang Jiao, Zhan Zhang, Ting Zhang, Wen Shi, Yan Zhu, Jie Hu, and Qin Zhang declare no conflicts of interests. This study protocol has been approved by the Ethics Committee of Suining Central Hospital, Sichuan Province, China. The Ethics Committee waived the requirement for informed consent because anonymous data were analyzed retrospectively.