Guan, Xiaodong
Ma, Lili
Wushouer, Haishaerjiang
Man, Chunxia
Han, Sheng
Shi, Luwen https://orcid.org/0000-0003-2683-6685
Article History
Received: 19 September 2017
Accepted: 6 March 2018
First Online: 4 April 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Our study was a retrospective survey, using data from patients over the past period of time, so we simply obtained verbal consent from all patients during the interview.
: Informed consent was obtained from all individual participants included in the study.