Funding for this research was provided by:
Beijing Municipal Administration of Hospitals Clinical Medicine Development of Special Funding Support (ZYLX201815)
Capital’s Funds for Health Improvement and Research (2014-1-2121)
Text and Data Mining valid from 2019-01-03
Received: 10 July 2018
Accepted: 10 December 2018
First Online: 3 January 2019
Ethics approval and consent to participate
: This study protocol was approved from the Human Research and Ethics Committee of Beijing Anding Hospital, Capital Medical University. All participants were informed of the objective of the study and gave written consent before the investigation.
: The authors declare that there is no conflict of interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.