1. aBiozentrum Grindel, Department of Animal Ecology and Conservation, University of Hamburg, Hamburg, Germany
2. bNocturnal Primate Research Group, Oxford Brookes University, Oxford, UK
3. cMichale E. Keeling Center for Comparative Medicine and Research, The University of Texas MD Anderson Cancer Center, Bastrop, TX, USA
4. dNeuroscience Institute & Language Research Center, Georgia State University, Atlanta, GA, USA