1. University of the Pacific; Arthur A Dugoni School of Dentistry; 155 5th Street San Francisco CA USA 94103
2. Cochrane; Bahrain Branch; Box 25438 Awali Bahrain
3. Plymouth University Peninsula Schools of Medicine and Dentistry; Peninsula Dental School; The John Bull Building, Tamar Science Park, Plymouth UK PL6 8BU
4. University of Detroit Mercy School of Dentistry; 2700 Martin Luther King Jr Blvd Detroit Michigan USA 48208-2576