1. Allergy and Rheumatology Unit, Division of Internal Medicine, Faculty of Medicine, Prince of Songkla University, Hat Yai, Thailand
2. Epidemiology Unit, Faculty of Medicine, Faculty of Medicine, Prince of Songkla University, Hat Yai, Thailand
3. Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
4. Infectious Disease Unit, Division of Internal Medicine, Faculty of Medicine, Prince of Songkla University, Hat Yai, Thailand
5. Division of Clinical Microbiology, Department of Pathology, Faculty of Medicine, Prince of Songkla University, Hat Yai, Thailand