1. Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand;
2. Department of Pulmonary and Critical Care Medicine, Maharaj Nakhon Si Thammarat Hospital, Nakhon Si Thammarat, Thailand;
3. Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand;
4. Department of Tropical Pathology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand