1. From the Department of Radiology and Research Center of Medical Sciences, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, the People's Republic of China (J.L., L.N.); and State Key Laboratory of Molecular Vaccinology and Molecular Diagnosis and Center for Molecular Imaging and Translational Medicine, School of Public Health, Xiamen University, Xiang’n South Road, Xiamen 361005, the People's Republic of China (J.L., Y.X., L.X.).