1. Department of Human Behavior, Ecology and Culture Max Planck Institute for Evolutionary Anthropology Leipzig Germany
2. Javan Gibbon Research and Conservation Project Bogor Indonesia
3. Division of Ecoscience Ewha Womans University Seoul South Korea
4. Biodiversity Foundation Seoul South Korea
5. Department of Forest Resources Conservation and Ecotourism, Faculty of Forestry and Environment IPB University Bogor Indonesia