1. Dhaka Dental College Hospital, Dhaka 1209, Bangladesh
2. University College London, Research Department of Epidemiology and Public Health, London WC1E 6BT, UK
3. Bangladesh Institute of Research and Rehabilitation in Diabetes, Endocrine and Metabolic Disorders (BIRDEM), Dhaka 1000, Bangladesh
4. Virginia Commonwealth University School of Medicine, Ashland, VA 23298-0565, USA
5. Oregon Health & Science University, School of Dentistry, 611 SW Campus Drive, Portland, OR 97239-3097, USA