Wang, Yan
Zheng, Zhaohui
Yang, Yuxian
Lang, Jianan
Zhang, Ning
Yang, Longyan
Zhao, Dong
Article History
Received: 19 January 2020
Accepted: 22 November 2020
First Online: 30 November 2020
Ethics approval and consent to participate
: The study complied with the Helsinki Declaration for investigation of human subjects. Ethical approval was obtained from the competent Institutional Review Boards of the Beijing Luhe Hospital and Capital Medical University. All patients provided written informed consent.
: Not Applicable.
: The authors declare that they have no conflicts of interest.