1. Department of Medicine Khon Kaen Hospital Khon Kaen Thailand
2. Department of Medicine, Ramathibodi Hospital Mahidol University Bangkok Thailand
3. Faculty of Public Health Khon Kaen University Khon Kaen Thailand
4. Department of Medicine, Srinagarind Hospital Khon Kaen University Khon Kaen Thailand
5. Department of Medicine Roi Et Hospital Roi Et Thailand
6. Department of Medicine Maharaj Nakhon Ratchasima Hospital Nakhon Ratchasima Thailand
7. Department of Medicine Surin Hospital Surin Thailand
8. Department of Medicine Tha Bo Hospital Nong Khai Thailand
9. Department of Medicine Udon Thani Hospital Udon Thani Thailand
10. Department of Medicine Nong Khai Hospital Nong Khai Thailand
11. Department of Medicine Mahasarakham Hospital Mahasarakham Thailand
12. Department of Medicine Chaiyaphum Hospital Chaiyaphum Thailand
13. Department of Medicine Loei Hospital Loei Thailand