Hongjun Li is a Professor and Director of the Department of Radiology in Beijing You An Hospital, Affiliated with Capital Medical University, Beijing, China. He is also the Chairman of Infectious Disease Radiology Specialty Committee of Chinese Society of Radiology.Jingzhe Liu is a Professor at Department of Radiology, The First Hospital of Tsinghua University, Beijing, China.Li Li is a Professor at Department of Radiology, Beijing You'an Hospital affiliated to Capital Medical University, Beijing, China.