The Impact of Influenza Epidemics on Mortality: Introducing a Severity Index.
Simonsen, Lone; Clarke, Matthew J.; Williamson, David; Stroup, Donna F.; Arden, Nancy H.; Schonberger, Lawrence B.; American Journal of Public Health, 1997, vol. 87, issue 12, p 1944, ISSN 00900036. ISBN 00900036.

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