1. Tianjin Key Laboratory of Radiation Medicine and Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300192, P.R. China
2. Molecular Imaging Program at Stanford (MIPS),
Department of Radiology and Bio-X Program, Canary Center at Stanford
for Cancer Early Detection, Stanford University, Stanford, California 94305, United States