1. Surgical manpower. A comparison of operations and surgeons in the United States and England and Wales;JP, I.Bunker;N EnglJ7 Med,1970
2. A comparison of surgical rates in Canada and England and Wales;Vayda, E.;N Engl J7 Med,1973
3. Morbidity data: what do we have? What do we need? What are we likely to get?;A, Fenton Lewis;Health Trends,1979
4. Do cholecystectomy rates correlate with geographic variations in prevalence of gallstones?;Mcl'herson, K.; Strong, P.; Jones, L.; Britton, J.;Lancet,1984
5. Regional variations in the use of common surgical procedures, within and between England and Wales, Canada and the United States of America;McPherson, K.; Strong, P.; Epstein, A.; Jones, L.;Soc Sci and Med,1981