Yu, Dong-Ni
Qiu, Lei
Ning, Shang-Yong
Guo, Li-Xin
Article History
Received: 19 January 2020
Accepted: 16 April 2020
First Online: 29 April 2020
Ethics approval and consent to participate
: This research was approved by The Institutional Review Board of Ethics Committee of Beijing Hospital. All participants received written and oral information prior to giving written consent, and the study was performed in accordance with the Helsinki II declaration.
: Not applicable.
: The authors declare that they have no competing interests.