1. Department of Migration and Immuno-Ecology; Max Planck Institute for Ornithology; Am Obstberg 1,78315; Radolfzell Germany
2. Department of Forest Biology; Faculty of Forestry; Kasetsart University; Bangkok 10900 Thailand
3. Department of Migration and Immuno-Ecology; Max Planck Institute for Ornithology; Am Obstberg 1, 78315 Radolfzell, and University of Konstanz; Department of Biology; Konstanz 78457 Germany
4. Food and Agriculture Organization of the United Nations (FAO), Emergency Center for Transboundary Animal Disease (ECTAD); Hanoi Vietnam
5. Faculty of Medicine; Chulalongkorn University; Bangkok 10330 Thailand
6. Department of National Parks; Wildlife and Plant Conservation; Ministry of Natural Resources and Environment; Bangkok Thailand