1. Molecular
Imaging Program at Stanford (MIPS), Bio-X Program, Department of Radiology, Stanford University, Stanford, California 94305-5344, United States
2. Department
of Radiation Oncology, Stanford University School of Medicine, Stanford, California 94305-5847, United States
3. School
of Computer and Information Technology, Beijing Jiaotong University, Beijing 100044, China
4. Department
of Ultrasound, Chinese Academy of Medical Science, Peking Union Medical College Hospital, Beijing 100730, China