1. Shahid Beheshti School of Dentistry; Department of Endodontics and Iranian Dental Research Centre; Daneshjou Boulevard Evin Tehran Iran 19834
2. Plymouth University Peninsula Schools of Medicine and Dentistry; Peninsula Dental School; The John Bull Building, Tamar Science Park, Plymouth UK PL6 8BU
3. University of Connecticut Health Center; Department of Oral Health and Diagnostic Sciences; 263 Farmington Avenue Farmington CT USA 06030
4. Cochrane; Bahrain Branch; Box 25438 Awali Bahrain
5. Nova Southeastern University; Dentistry; 3200 South University Drive Fort Lauderdale Florida USA 33328-2018