1. Alternative and Complementary Medicine for Gastrointestinal and Liver Diseases Research Unit, Department of Physiology, Faculty of Medicine, Chulalongkorn University, Pathumwan, Bangkok, Thailand.
2. Center of Excellence in Hepatitis and Liver Cancer, Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Pathumwan, Bangkok, Thailand.
3. Department of Medicine, Phramongkutklao Hospital, Ratchathewi, Bangkok, Thailand.