The Dutch Surgical Colorectal Audit

A new method of classifying prognostic comorbidity in longitudinal studies: Development and validation

Mary E. Charlson, Peter Pompei, Kathy L. Aleš et al. · Journal of Chronic Diseases · 1987 · 49.9K citations

Public Health, Biostatistics, Clinical Classification Systems +15

Validation of a combined comorbidity index

Mary E. Charlson, Ted P. Szatrowski, Janey C. Peterson et al. · Journal of Clinical Epidemiology · 1994 · 6.6K citations

Education, Health Sciences, Internal Medicine +12

Funnel plots for comparing institutional performance

David J. Spiegelhalter · Statistics in Medicine · 2004 · 819 citations

Education, Economics, Causal Inference +15

Successful Implementation of the Department of Veterans Affairs’ National Surgical Quality Improvement Program in the Private Sector: The Patient Safety in Surgery Study

Shukri F. Khuri, William G. Henderson, Jennifer Daley et al. · Annals of Surgery · 2008 · 556 citations

Health Professions, Health Services Administration, Surgery +17

The Swedish rectal cancer registry

Lars Påhlman, M. Bohe, Björn Cedermark et al. · British journal of surgery · 2007 · 384 citations

Medicine, Oncology, Surgery +15