Funding for this research was provided by:
Beijing Municipal Administration of Hospitals’ Ascent Plan (DFL20150802)
Acknowledgements-Beijing Municipal commission of Health and Family Planning from National Clinical Research Center for Geriatric Disorders (PXM2017_026283_000002)
Beijing Municipal Administration of Hospitals Clinical Medicine Development of Special Funding Support (ZYLX201706, ZYLX201813)
Received: 26 January 2019
Accepted: 19 June 2019
First Online: 29 June 2019
Ethics approval and consent to participate
: Approval was obtained from the Institutional Review Board of Xuanwu Hospital, Capital Medical University, code: 2017(074). The study was prospectively registered at ExternalRef removed (code: ChiCTR-IOR-16008720) on June 25, 2016, and written informed consent was obtained from all participants before enrollment.
: Not applicable.
: The authors declare that they have no competing interests.