1. Section for Clinical Epidemiology and Biostatistics, Faculty of Medicine Ramathibodi Hospital, Mahidol University Bangkok Thailand
2. Department of Periodontology, Faculty of Dentistry Chulalongkorn University Bangkok Thailand
3. Division of Nephrology, Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University Bangkok Thailand
4. Medical and Health Division Electricity Generating Authority of Thailand Nonthaburi Thailand
5. Centre for Clinical Epidemiology and Biostatistics, School of Medicine and Public Health University of Newcastle Newcastle New South Wales Australia
6. Hunter Medical Research Institute Newcastle New South Wales Australia
7. Division of Cardiology, Department of Medicine, Faculty of Medicine, Ramathibodi Hospital Mahidol University Bangkok Thailand