WHO. Global epidemiological surveillance standards for influenza. 2013 [27 September 2020]; Available from: ▇▇▇▇▇://▇▇▇.▇▇▇.▇▇▇/influenza/resources/documents/WHO_Epidemiological_Influenza_Surveil- lance_Standards_2014.pdf?ua=1.
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Sources: License Agreement Concerning Inclusion of Doctoral Thesis in the Institutional Repository of the University of Leiden, License Agreement Concerning Inclusion of Doctoral Thesis in the Institutional Repository of the University of Leiden