1. Molecular
Imaging Program at Stanford (MIPS), Canary Center at Stanford for
Cancer Early Detection, Department of Radiology and Bio-X Program,
School of Medicine, Stanford University, Stanford, California 94305-5484, United States
2. Key Laboratory for Organic Electronics & Information Displays and Institute of Advanced Materials, Nanjing University of Posts & Telecommunications, Nanjing 210046, China
3. Department
of Radiation Oncology, School of Medicine, Stanford University, Stanford, California 94305, United States