1. Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand.
2. Phichit Hospital, Amphoe Meuang, Phichit, Thailand.
3. Chiangrai Prachanukroh Hospital, Amphoe Meuang, Chiangrai, Thailand.
4. Department of Oriental Medicine, ChiangRai College, Chiangrai, Thailand.
5. Sawan Pracharak Hospital, Amphoe Meuang, Nakorn Sawan, Thailand.
6. Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.
7. Centre of Excellence in Medical Biotechnology, Naresuan University, Phitsanulok, Thailand.