1. Japan Monkey Center, Inuyama, Japan
2. Primate Cognition Research Group, Lisbon, Portugal
3. Primate Research Institute, Kyoto University, Inuyama, Japan
4. Department of Anthropology, Kent State University, Kent, OH, USA
5. Conservation Through Public Health, Entebbe, Uganda
6. Wildlife Research Centre, Kyoto University, Kyoto, Japan
7. Chubu Gakuin University, Kakamigahara, Gifu, Japan