1. Oxford English Dictionary. Oxford: Oxford University Press, 1999.
2. Kane RL. Approaching the outcomes question. In: Kane R, ed. Understanding Health Care Outcomes Research. Gaithersburg, MD: Aspen Publications, 1997:1?16.
3. Donabedian A. Evaluating the quality of medical care. Milbank Memorial Fund Q 1966;XLIV:166?206.
4. World Health Organization. World Health Organization Constitution. Geneva: World Health Organization, 1948.
5. Karnofsky DA, Abelman WH, Craver LF, Burchenal JH. The use of nitrogen mustards in palliative treatment of carcinoma. Cancer 1998;1:632?56.