1. Thai Red Cross Emerging Infectious Diseases Health Science Centre, World Health Organization Collaborating Centre for Research and Training on Viral Zoonoses, King Chulalongkorn Memorial Hospital, Faculty of Medicine Chulalongkorn University Bangkok Thailand
2. Division of Infectious Diseases, Department of Medicine, Faculty of Medicine, Thai Red Cross Emerging Infectious Diseases Clinical Centre, King Chulalongkorn Memorial Hospital Chulalongkorn University Bangkok Thailand
3. Department of Pediatrics, Faculty of Medicine, Thai Red Cross Emerging Infectious Diseases Clinical Centre, King Chulalongkorn Memorial Hospital Chulalongkorn University Bangkok Thailand
4. Department of Disease Control Ministry of Public Health Nonthaburi Thailand