1. Udayana University Department of Public Health and Preventive Medicine, Faculty of Medicine, , Bali 80232 , Indonesia
2. Udayana University Travel Medicine Unit, Faculty of Medicine, , Bali 80232 , Indonesia
3. Thai Travel Clinic, Hospital for Tropical Diseases, Mahidol University Faculty of Tropical Medicine, , Bangkok 10400 , Thailand
4. Mahidol University Travel Medicine Research Unit, Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, , Bangkok 10400 , Thailand
5. The Australian National University Rural Clinical School, ANU Medical School, , Canberra 2601 , Australia