1. Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
2. Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital and Department of Radiology, Harvard Medical School, Boston, Massachusetts 02114, United States
3. Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan