Zhu, Wei-wei
Li, Hong
Li, Yi-dan
Sun, Lanlan
Kong, Lingyun
Ye, Xiaoguang
Cai, Qizhe
Lv, Xiu-zhang
Article History
Received: 28 February 2021
Accepted: 9 July 2021
First Online: 15 July 2021
Declarations
:
: The study was approved by the Ethics Committee of Beijing Chaoyang Hospital Affiliated to Capital Medical University. Informed consent was waived because of the retrospective nature of the study and was approved by the Ethics Committee of Beijing Chaoyang Hospital Affiliated to Capital Medical University. The study was performed in accordance with the Declaration of Helsinki. All methods were carried out in accordance with relevant guidelines and regulations in the Ethics approval.
: The content presented is original and has not been published elsewhere.
: The authors have no conflict of interest connected with this study.