Earnshaw SR, Candrilli SD, Fernandes AW, Higashi MK. A cost-effectiveness analysis of antibiotic therapy in macrolide-resistant community-acquired pneumonia. Managed Care Interface. 2005 Oct 1;18(10):36-44.
Rothman KJ, Greenland S. Causation and causal inference in epidemiology. Am J Public Health. 2005 Jan 1;95(Suppl 1):S144-150.