1. Department for Behavioral Ecology, University of Göttingen, Göttingen, Germany
2. Endocrinology Laboratory, German Primate Centre, Leibniz Institute for Primate Research, Göttingen, Germany
3. Institute for Parasitology, Centre for Infection Medicine, University of Veterinary Medicine Hannover, Hanover, Germany
4. Department of Life Sciences, University of Roehampton, Parkstead House, Whitelands, London, UK
5. Department for Animal Behaviour, Bielefeld University, Bielefeld, Germany
6. Department of Wildlife Diseases, Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany
7. Primate Social Evolution, German Primate Centre, Leibniz Institute for Primate Research, Göttingen, Germany