1. Queen Mary University of London; Clinical and Diagnostic Oral Sciences, Barts and The London School of Medicine and Dentistry; Turner Street Whitechapel London UK E1 2AD
2. Barts and The London School of Medicine and Dentistry, Queen Mary University of London; Adult Oral Health, Institute of Dentistry; London UK
3. University of Texas, Dental School; WHO Collaborating Center & Dental Hispanic Center of Excellence; UTHSCSA General Dentistry 7703 Floyd Curl Drive San Antonio Texas USA 78229
4. Centre for Dentistry, University of Zurich; Oral Epidemiology & Preventive Dentistry; Zurich Switzerland