1. 1.Hayward, R. S., Wilson, M. C., Tunis, S. R., Bass, E. B., Guyatt, G., The Evidence-Based Medicine Working Group. (1995) Users' guides to the medical literature, VIII. How to use clinical practice guidelines, A. Are the recommendations valid? JAMA 274, 570–574.
2. National Health and Medical Research Council of Australia. (1999)A guide to the development, implementation, and evaluation of clinical practice guidelines. The National Health and Medical Research Council of Australia.
3. 3.Browman, G. P. (2001) Development and aftercare of clinical guidelines: The balance between rigor and pragmatism. JAMA 286, 1509–1511.
4. Global Programme on Evidence for Health Policy. (2003) Guidelines for WHO guidelines. World Health Organization, Geneva, Switzerland.
5. 5.Guyatt, G., Vist, G., Falck-Ytter, Y., Kunz, R., Magrini, N., Schunemann, H. (2006) An emerging consensus on grading recommendations? Evid Based Med 11, 2–4.