Short-term effects of air pollution on total and cardiovascular mortality: the confounding effect of influenza epidemics.
Touloumi G, Samoli E, Quenel P, Paldy A, Anderson RH, Zmirou D, Galan I, Forsberg B, Schindler C, Schwartz J, Katsouyanni K. Short-term effects of air pollution on total and cardiovascular mortality: the confounding effect of influenza epidemics. Epidemiology. 2005 Jan; 16(1):49-57.