1. Department of Medicine, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital , Bangkok , Thailand
2. Faculty of Medicine, Chiang Mai University , Chiang Mai , Thailand
3. Department of Microbiology, Faculty of Medicine, Chulalongkorn University , Bangkok , Thailand
4. Department of Preventive and Social Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University , Bangkok , Thailand
5. Department of Medicine, Jackson Memorial Hospital/University of Miami , Miami, Florida , USA
6. Faculty of Medicine, Srinakharinwirot University , Nakhon Nayok , Thailand
7. Department of Medicine, Johns Hopkins University School of Medicine , Baltimore, Maryland , USA
8. Critical Care Medicine Department, National Institutes of Health , Bethesda, Maryland , USA
9. Faculty of Allied Health Sciences, Chulalongkorn University , Bangkok , Thailand
10. Department of Medicine, University of Arizona College of Medicine , Tucson, Arizona , USA