1. Department of Radiology, Prince Sultan Military Medical City, PO Box 7897, Riyadh 11159, Kingdom of Saudi Arabia.
2. Division of Image Guided Therapy, Department of Diagnostic Imaging, The Hospital for Sick Children, Toronto, ON, Canada.
3. Division of Nuclear Medicine, Department of Diagnostic Imaging, The Hospital for Sick Children, Toronto, ON, Canada.
4. Department of Hematology and Oncology, The Hospital for Sick Children, Toronto, ON, Canada.