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M. E. Charlson, P. Pompei, K. L. Ales and C. R. MacKenzie, “A New Method of Classifying Prognostic Comorbidity in Longitudinal Studies: Development and Validation,” Journal of Chronic Diseases, Vol. 40, No. 5, 1987, pp. 373-383. doi:10.1016/0021-9681(87)90171-8
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