1. Cochrane Oral Health; Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester; Manchester UK
2. Canadian Agency for Drugs and Technologies in Health (CADTH); Ottawa Canada
3. Department of Oral Maxillofacial Pathology, Radiology and Medicine; New York University College of Dentistry; New York USA
4. Clinic of Conservative and Preventive Dentistry; Center for Dental and Oral Medicine and Maxillo-Facial Surgery, University of Zurich; Zurich Switzerland
5. Texas Medical Center Library; Houston Academy of Medicine; Houston USA
6. School of Medicine; University of Central Lancashire; Preston UK
7. Argentine Dental Association (AOA); Buenos Aires Argentina