Pandemic influenza severity assessment (PISA): a WHO guide to assess the severity of influenza in seasonal epidemics and pandemics

World Health Organization

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World Health Organization. (‎2017)‎. Pandemic influenza severity assessment (‎PISA)‎: a WHO guide to assess the severity of influenza in seasonal epidemics and pandemics. World Health Organization. https://apps.who.int/iris/handle/10665/259392. License: CC BY-NC-SA 3.0 IGO