Institution: | a H. John Heinz III School of Public Policy and Management, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213, USAb RAND Drug Policy Research Center, 201 N. Craig Street, Suite 102, Pittsburgh, PA 15213, USAc Department of Operations Research and Systems Theory, Vienna University of Technology, Argentinierstrasse 8, A-1040 Vienna, Austria |