1 Dept. of Population Health Sciences, section Animals in Science and Society, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands. Electronic address: [email protected].
2 Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, USA.
3 Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA; Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA.