1. Department of Dental Public Health, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
2. Department of e-Learning in Medical Sciences, Virtual School, Center of Excellence for e-Learning, Shiraz University of Medical Sciences, Shiraz, Iran
3. Student Research Committee, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
4. Department of Endodontics, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran
5. Faculty of Mathematics and Statistics, Ton Duc Thang University, Ho Chi Minh City, Vietnam