1. Department of Periodontics School of Dentistry Hamadan University of Medical Sciences Hamadan Iran
2. Basic and Molecular Epidemiology of Gastrointestinal Disorder Research Center Research Institute for Gastroenterology and Liver Diseases Shahid Beheshti University of Medical Science Tehran Iran
3. Dental Research Center Hamadan University of Medical Sciences Hamadan Iran
4. Department of Periodontology Dental Faculty – Radiation Sciences Research Center Laser Research Center in Medical Sciences AJA University of Medical Sciences Tehran Iran