1. Ivey Business School, Western University, London, Ontario N6G 0N1, Canada
2. Department of Economics, University of Oxford, Oxford OX1 3UQ, United Kingdom
3. Department of Economic Sciences and Center for Neuroeconomics Studies, Claremont Graduate University, Claremont, California 91711
4. Behavioral Health Institute, Loma Linda University, Loma Linda, California 92350