Xue, Hai
Yang, Zhijun
Liu, Jian
Wang, Xingchao
Bi, Zhiyong
Liu, Pinan http://orcid.org/0000-0003-1312-2288
Article History
Received: 24 August 2019
Revised: 11 October 2019
Accepted: 24 October 2019
First Online: 12 December 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards and approved by the ethics committee of Beijing Tiantan Hospital.
: Consent was obtained from all patients for information collection and analysis.