1 Diagnostic Imaging Center, Fox Chase Cancer Center, Philadelphia, PA 19111, USA. s.m.javad.mortazavi@fccc.edu.
2 Ionizing and Non-ionizing Radiation Protection Research Center (INIRPRC), Shiraz University of Medical Sciences, Shiraz 7134845794, Iran. qaz.mortazavi@gmail.com.
3 Oral and Maxillofacial Radiology Department, School of Dentistry, Shiraz University of Medical Sciences, Shiraz 713451836, Iran. paknahadmaryam@yahoo.com.