The Division of Comparative Effectiveness and Outcomes Research in the Department of Population Health Sciences reviews and compares existing health care interventions to determine which one works best for specific patient populations, and which one is the most cost-effective for patients, hospitals, insurers and other health care providers. This research can be used to compare medications, medical devices, procedures and healthcare delivery interventions. Division research includes evaluating the effectiveness and cost-effectiveness of medical interventions to treat HIV, hepatitis C and breast cancer, and tracking associations between patient characteristics and orthopedic surgical outcomes. Division faculty members frequently collaborate with infectious diseases, radiology and genetic medicine investigators from Weill Cornell Medicine, as well as outside researchers from the Hospital for Special Surgery, Cornell Ithaca’s Department of Policy Analysis and Management and the Harvard School of Public Health.