1. MRC–University of Glasgow Centre for Virus Research, Glasgow, Scotland, United Kingdom
2. Biologicals Research Group, Research and Development Institute, Government Pharmaceutical Organization, Bangkok, Thailand
3. Department of Clinical Pathology, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, Bangkok, Thailand
4. Department of Microbiology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand