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Dietary n-3 Polyunsaturated Acids and Smoking-Related Chronic Obstructive Pulmonary DiseaseShahar, E.; Folsom, A. R.; Melnick, S. L.; Tockman, M. S.; Comstock, G. W.; Gennaro, V.; Higgins, M. W.; Sorlie, P. D.; Ko, W.-J.; Szklo, M. · American Journal of Epidemiology · 2008