1 Department of Pharmaceutical and Health Economics, School of Pharmacy, University of Southern California, Los Angeles, CA, USA.
2 Leonard D. Schaeffer Center for Health Policy and Economics, University of Southern California, Los Angeles, CA, USA.
3 Department of Clinical Pharmacy, Center for Pharmaceutical Outcomes Research (CePOR), Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA. robert.mcqueen@cuanschutz.edu.