1. General acknowledgments
2. Committee to advise the public health service on clinical practice guidelines. In: Clinical Practice Guidelines: Directions for a New Program, edited by Field MJ, Lohr KN, Washington, DC, National Academy Press, 1990
3. American Medical Association/Specialty Society Practice Parameters Partnership, Revised: Attributes to Guide the Development, and Evaluation of Practice Parameters/Guidelines, 1996, pp1 -10
4. Haynes RB, Sackett DL, Gray JM, Cook DJ, Guyatt GH: Transferring evidence from research into practice. 1. The role of clinical care research evidence in clinical decisions. ACP Journal Club Nov/Dec1996