1. VA Boston Healthcare System, Center for Healthcare Organization, Implementation and Research, Boston, Massachusetts
2. Department of Surgery, Boston University Chobian and Avedisian School of Medicine, Boston, Massachusetts
3. VA Iowa City Health Care System, Iowa City
4. Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City
5. Department of Internal Medicine, Boston University Chobian and Avedisian School of Medicine, Boston, Massachusetts