1. Psychological and Brain Sciences, University of Massachusetts, Tobin Hall, 135 Hicks Way, Amherst, MA 01003, USA
2. Department of Psychology, Wayne State University, Detroit, MI, USA
3. Max Planck Institute for Human Development, Berlin, Germany
4. University of Veterinary Medicine, Foundation, Hannover, Germany
5. Keeling Center for Comparative Medicine and Research, University of Texas, MD Anderson Cancer Center, Bastrop, TX, USA
6. Department of Psychology, Emory University, Atlanta, GA, USA