Use of Sedative-Hypnotics and Mortality: A Population-Based Retrospective Cohort Study

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

Coding Algorithms for Defining Comorbidities in ICD-9-CM and ICD-10 Administrative Data

Hude Quan, Vijaya Sundararajan, Patricia Halfon et al. · Medical Care · 2005 · 10.6K citations

Health Professions, Internal Medicine, Clinical Classification Systems +16

Data Resource Profile: The National Health Information Database of the National Health Insurance Service in South Korea

Sang Cheol Seong, Yeon-Yong Kim, Young‐Ho Khang et al. · International Journal of Epidemiology · 2016 · 1.3K citations · Full text

Public Health, Health Sciences, Epidemiology +6

Problem of immortal time bias in cohort studies: example using statins for preventing progression of diabetes

Linda E. Lévesque, J. A Hanley, Abbas Kezouh et al. · BMJ · 2010 · 1.2K citations

Public Health, Biostatistics, Pharmacotherapy +12

Insomnia and Its Treatment

Glen D. Mellinger · Archives of General Psychiatry · 1985 · 1.1K citations

Medicine, Pharmacology, Pharmacotherapy +17