1. The incidence of tonsillectomy in school children;Glover,1938
2. Are hospital services rationed in New Haven or over-utilized in Boston?;Wennberg;Lancet,1987
3. Variations in the use of medical and surgical services by the medicare population;Chassin;N Engl J Med,1986
4. Guidelines for coronary angiography;Ross;J Am Coll Cardiol,1987
5. Clinical Practice Guideline Number 7;US Department of Health and Human Services, Public Health Service;Evaluation and Management of Early HIV Infection,1994