Wang, Fen
Guo, Dongmei
Liu, Zheng
Zhou, Aihong
Wei, Cuibai
Jia, Jianping http://orcid.org/0000-0003-4624-0336
Funding for this research was provided by:
National Natural Science Foundation of China (81100797)
Beijing high-level health talents training project (2015-3-068)
Article History
Received: 12 November 2017
Accepted: 3 July 2018
First Online: 7 August 2018
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: This retrospective study received ethical approval from the Xuan Wu Hospital institutional review board. Formal consent is not required for this type of study.