1. Department of Surgery, Lerdsin Hospital; Department of Medical Services, Ministry of Public Health; Bangkok Thailand
2. Department of Surgery; College of Medicine, Rangsit University; Bangkok Thailand
3. Institute of Medical Research and Technology Assessment, Dept of Medical Services; Ministry of Public Health; Nonthaburi Thailand
4. Bhumirajanagarindra Kidney Institute; Bangkok Thailand
5. Department of Surgery; Chiangmai University; Chiangmai Thailand
6. Department of Epidemiology and Biostatistics, Faculty of Public Health; Khon Kaen University; Khon Kaen Thailand