1. Oral and Dental Disease Research Center, Department of Oral Medicine, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
2. Clinical Neurology Research Center, Medical School, Shiraz University of Medical Sciences, Shiraz, Iran.
3. Department of Oral and Maxillofacial Surgery, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
4. Department of Oral Medicine, School of Dentistry, Bushehr University of Medical Sciences, Bushehr, Iran.
5. Student Research Committee, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.