Ali Gholamrezanezhad is Assistant Professor of Clinical Radiology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA. Majid Assadi is Professor of Nuclear Medicine and Chairman of the Department of Nuclear Medicine, Bushehr University of Medical Sciences, Bushehr, Iran. Hossein Jadvar is Associate Professor of Radiology, Urology, and Biomedical Engineering, University of Southern California, Los Angeles, California, USA.