He, Fan http://orcid.org/0000-0003-2000-7894
Wang, Lisi
Zhang, Chanyu
Li, Sanglin
Sun, Chengguang
Hu, Lina
Article History
Received: 26 January 2018
Accepted: 28 July 2018
First Online: 16 August 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was conducted after approval and according to the guidelines of the institutional review board of The Second Affiliated Hospital of Chongqing Medical University (Approval Number: 2018-2). Individual consent to participate in the study was not obtained since it was a medical records-based retrospective study.