1 Epidemiology, and Public Health, Veterans Affairs Maryland Healthcare System, University of Maryland School of Medicine, 685 W Baltimore St, Baltimore, MD 21201, USA.
2 Lown Institute, Dartmouth School of Medicine, Boston, MA, USA.
3 Knowledge and Evaluation Research Unit, Mayo Clinic, MN, USA.
4 Boston VA and Boston University, Boston, MA, USA.
5 Yale University and New Haven VA, New Haven, CT, USA.
6 University of Toronto, Toronto, Ontario, Canada.
7 Department of Health Care Policy, Beth Israel Deaconess Medical Center, Boston, MA, USA.
8 Lewin Group's Federal Health And Human Services Practice, Washington, DC, USA.
9 Medical Ethics and Health Policy, University of Pennsylvania, Philadelphia, PA, USA.
10 Lown Institute, Harvard Medical School, Brookline, MA, USA.
11 Menzies Centre for Health Policy, Sydney School of Public Health, University of Sydney, Australia Lown Institute, Sydney, Australia.
Although overuse in medicine is gaining increased attention, many questions remain unanswered. Dan Morgan and colleagues propose an agenda for coordinated research to improve our understanding of the problem