1. Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown 02129, United States
2. Department of Nuclear Medicine and PET/CT-MRI Center, The First Affiliated Hospital of Jinan University, Guangzhou 510630, China
3. Division of Nuclear Medicine and Molecular Imaging, Center for Advanced Medical Imaging Sciences, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, United States
4. Harvard–MIT Division of Health Sciences and Technology, Cambridge, Massachusetts 02139, United States
5. Bioengineering Department, Universidad Carlos III de Madrid, Madrid 28911, Spain