1. Department of Applied Thai Traditional Medicine, Faculty of Medicine, Thammasat University, Pathum Thani 12120, Thailand
2. Gastroenterology Unit, Department of Medicine, Thammasat University, Pathum Thani 12120, Thailand
3. Center of Excellence in Applied Thai Traditional Medicine Research, Thammasat University, Pathum Thani 12120, Thailand
4. Division of Applied Thai Traditional Medicine, Faculty of Public Health, Naresuan University, Phitsanulok 65000, Thailand