Funding for this research was provided by:
Beijing Municipal Administration of Hospitals' Youth Program (QML20160503)
National Natural Science Foundation of China (81701038)
Beijing Municipal Administration of Hospitals Clinical Medicine Development of Special Funding Support (ZYLX201708)
Received: 1 September 2019
Accepted: 10 May 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: This study protocol was approved by China Ethics Committee of Registering Clinical Trials (ChiECRCT-20160051). All ethical aspects were considered. Written informed consent will be obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.