Acknowledgments
The skilled technical assistance of Qinghao Liu (Peking University First Hospital) is gratefully acknowledged. The authors also acknowledge all physicians and nurses at each center participating in the enrollment of patients. This study was supported by grants from the National Natural Science Foundation of China (81970701); the National Key Research and Development Program (2016YFC1305401 and 2016YFC1305405); the Beijing Science and Technology Plan Project (D171100002817001); and Project 2020BD040 supported by PKU-Baidu Fund.