1. VA Portland Health Care System, Portland Alcohol Research Center, Methamphetamine Abuse Research Center; Oregon Health & Science University; Portland OR USA
2. Department of Behavioral Neuroscience, Portland Alcohol Research Center, Methamphetamine Abuse Research Center; Oregon Health & Science University; Portland OR USA
3. Area de Psicobiología, Universitat Jaume I; 12071 Castellón Spain
4. Department of Psychology, Reed College; Portland OR USA