1. Carman & Ann Adams Department of Pediatrics, School of Medicine, Wayne State University, Detroit, Michigan 48201, United States
2. Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Texas 735390, United States
3. Department of Nuclear Medicine, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, P. R. China
4. Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States