1. Geriatrics and Extended Care Data Analysis Center, Palo Alto, California; Canandaigua, New York Philadelphia Pennsylvania USA
2. VA Palo Alto Health Economics Resource Center (HERC) Menlo Park California USA
3. Department of Veterans Affairs Washington District of Columbia USA
4. Stanford University Stanford California USA
5. University of Rochester Rochester New York USA
6. Center for Health Equity Research and Promotion (CHERP) Philadelphia Pennsylvania USA
7. Cpl. Michael J Crescenz VA Medical Center (Philadelphia) Philadelphia Pennsylvania USA
8. University of Pennsylvania Philadelphia Pennsylvania USA