1. Department of Radiology, Faculty of Dentistry, Hamadan University of Medical sciences, Hamadan, Iran
2. Department of Medical Physics, Faculty of Medicine, Hamadan University of Medical sciences, Hamadan, Iran
3. Department of Medical Physics, Royal Adelaide Hospital, Adelaide, South Australia, Australia
4. School of Mechanical Engineering, Shiraz University, Shiraz, Iran
5. Department of Epidemiology and Biostatistics, Research Centre for Health Sciences, Faculty of Health, Hamadan University of Medical Sciences, Hamadan, Iran