1. Department of Medicine, Division of Geriatrics University of Colorado Anschutz Medical Campus Aurora Colorado USA
2. Department of Economics Univerity of Colorado Denver
3. Department of Health Policy and Management Johns Hopkins Bloomberg School of Public Health Baltimore Maryland USA
4. Carey School of Business John Hopkins University Washington DC USA
5. Skaggs School of Pharmacy and Pharmaceutical Sciences University of Colorado Aurora Colorado USA
6. Department of Health Services, Policy, and Practice Brown University School of Public Health Providence Rhode Island USA