1. Roos NP, Wennberg JE, McPhearson K. Using diagnosis related groups for studying variations in hospital admissions. Health Care Financing Rev. 1988;9(4):53–62.
2. Eddy DM. Variations in physician practice: the role of uncertainty. Health Aff. 1984;3(2):74–89.
3. Avorn J, Soumerai SB, Everitt DE, et al. A randomized trial of a program to reduce the use of psychoactive drugs in nursing homes. N Engl J Med. 1992;327:168–73.
4. Clementz GL, Aldag JC, Gladfelter TT, Barclay AM, Brooks HF. A randomized study of cancer screening in a family practice setting using a recall model. J Fam Pract. 1990;30:537–41.
5. Spencer DC, Balas EA, Nashelsky JE. Information management. In: Taylor RB, ed. Family Medicine: Principles and Practice. 4th ed. New York, NY: Springer-Verlag; 1993.