1. Applied Medical Virology Research Unit, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
2. Department of Oral Biology, Faculty of Dentistry, Mahidol University, Bangkok 10400, Thailand
3. Faculty of Medicine, King Mongkut's Institute of Technology, Bangkok 10520, Thailand
4. Division of Allergy and Clinical Immunology, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand