Department of Biochemistry;
Faculty of Medicine;
Chiang Mai University;
Chiang Mai;
50200 Thailand;
Department of Biochemistry;
Faculty of Medicine;
Chulalongkorn University;
Bangkok;
10330 Thailand;
Viral Hepatitis Research Unit;
Department of Pediatrics;
Faculty of Medicine;
Chulalongkorn University;
Bangkok;
10330 Thailand;