1 Department of Addictive Behavior and Addiction Medicine, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J5, D-68159, Mannheim, Germany. karl.mann@zi-mannheim.de.
2 Department of Psychology, Center on Alcoholism, Substance Abuse, and Addictions, University of New Mexico, 2650 Yale Blvd SE, Albuquerque, NM, 87106, USA.