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Journal of General Internal Medicine > 2006 > 21 > 3 > 245-250
Journal of General Internal Medicine > 2006 > 21 > 3 > 245-250
Journal of General Internal Medicine > 2006 > 21 > 3 > 245-250
Annals of Epidemiology > 1997 > 7 > 2 > 87-94