1. Oral & Dental Sciences Research Group, School of Medicine and Dentistry, University of Central Lancashire, Preston, UK
2. Specialist in Special Care Dentistry, University of Central Lancashire, Preston, UK
3. School of Forensic and Investigative Sciences, University of Central Lancashire, Preston, UK
4. School of Psychology, University of Central Lancashire, Preston, UK
5. Department of Periodontology, College of Dentistry, University of Florida, Gainesville, FL, USA