1. Department of Disease Control, Bamrasnaradura Infectious Diseases Institute, Nonthaburi, Thailand
2. Department of Preventive and Social Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
3. Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
4. 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