Ma, Xiangke
Yang, Yang
Zhou, Yiming
Jia, Weihua
Article History
Received: 24 June 2018
Revised: 23 August 2018
Accepted: 10 September 2018
First Online: 17 September 2018
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: Approval for the retrospective study was obtained from the research ethics committee of Chaoyang Hospital affiliated with the Capital Medical University.
: All individual participants included in the study provided informed consent.