Selwyn D. Collins, W. H. Frost, Mary Gover, Edgar Sydenstricker, Mortality from Influenza and Pneumonia in 50 Large Cities of the United States, 1910-1929, Public Health Reports (1896-1970), Vol. 45, No. 39 (Sep. 26, 1930), pp. 2277-2328
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Collins et al. (1930) studied this question.
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