1. College of Medicine and Public Health, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand
2. Division of Pharmacy Practice, Faculty of Pharmaceutical Sciences, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand
3. Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
4. Departments of Medical Technology and Sciences, International University of Health and Welfare, Ohkawa, Fukuoka 831-8501, Japan