Funding for this research was provided by:
The Capital Research Project of Specialty Clinical Application (Z181100001718220)
Beijing Municipal Administration of Hospitals Ascent Plan (DFL20150101)
Received: 5 September 2019
Accepted: 2 December 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: Data collection and analysis were performed according to the ethical standards of the Helsinki Declaration. The study was approved by the Ethical Committee of Beijing Friendship Hospital, Capital Medical University (Approval ID: 2019-P2–154-01).
: Not applicable.
: All authors declare that they have no competing interests.