WHO. Public health surveillance for COVID-19. Interim guidance. 2020 [21 August 2020]; Available from: ▇▇▇▇▇://▇▇▇.▇▇▇.▇▇▇/publications/i/item/who-2019-nCoV-surveillanceguidance-2020.7.
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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