Funding for this research was provided by:
Beijing Municipal Health System High-level Health Technical Personnel Training Program (2015-3-043)
Beijing Municipal Administration of Hospitals Incubating Program (PX2017005)
Received: 8 August 2017
Accepted: 10 December 2017
First Online: 15 January 2018
Ethics approval and consent to participate
: All procedures performed in studies involving human participants have received Beijing Tiantan Hospital ethics approval.
: The study has received all related patients’ written informed consent.
: The authors report no conflict of interest.