Performance of Comorbidity Scores to Control for Confounding in Epidemiologic Studies using Claims Data.
Schneeweiss, Sebastian; Seeger, John D.; Maclure, Malcolm; Wang, Philip S.; Avorn, Jerry; Glynn, Robert J.; American Journal of Epidemiology, 2001, vol. 154, issue 9, p 854, ISSN 00029262. ISBN 00029262.

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