Liu, Na
Yang, Guihua
Hu, Mei
Han, Jing
Cai, Yuyu
Hu, Zhiying
Jia, Chundi
Zhang, Man http://orcid.org/0000-0001-5166-6804
Funding for this research was provided by:
Beijing Municipal Administration of Hospitals’ Ascent Plan (DFL20150701)
Article History
Received: 8 May 2017
Accepted: 20 February 2018
First Online: 2 March 2018
Compliance with ethical standards
: The study protocol was approved by the Beijing Shijitan Hospital Ethics Committee, Capital Medical University. Written informed consent was obtained from all the participants before their enrolment in the study.
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.