1. Khon Kaen University; Department of Biostatistics and Demography, Faculty of Public Health; 123 Mitraparb Road Amphur Muang Khon Kaen Thailand 40002
2. Faculty of Medicine; Community Medicine; Chiang Mai University 110 Intawaroros Chiang Mai North Thailand 50200
3. University of Medicine; Department of Preventive and Social Medicine; Yangon Myanmar