1. Sol Price School of Public Policy, University of Southern California, Los Angeles, CA 90007, United States
2. University of Houston College of Pharmacy, Houston, TX 77204, United States
3. School of Pharmacy and Schaeffer Center for Health Policy and Economics, University of Southern California, Los Angeles, CA 90007, United States
4. Center for Economic and Social Research, University of Southern California, Los Angeles, CA 90007, United States
5. Daniel J Epstein Department of Industrial and Systems Engineering, Viterbi School of Engineering, University of Southern California, Los Angeles, CA 90089, United States