1. Department of Radiology, Division of Nuclear Medicine, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjyuku-ku, Tokyo 162-8655, Japan
2. Department of Radiology, Pediatric Molecular Imaging Program at Stanford, Stanford University, Stanford, CA
3. Department of Radiology, Division of Nuclear Medicine and Molecular Imaging, Stanford University, Stanford, CA