1Center of Excellence in Clinical Virology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
2Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
3Division of Infectious Diseases, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand. JFIF d d Ducky d qhttp://ns.adobe.com/xap/1.0/