COVID RADAR app: Description and validation of population surveillance of symptoms and behavior in relation to COVID-19. by Willian J van Dijk, Nicholas H Saadah, Mattijs E Numans, Jiska J Aardoom, Tobias N Bonten, Menno Brandjes, Michelle Brust, Saskia le Cessie, Niels H Chavannes, Rutger A Middelburg, Frits Rosendaal, Leo G Visser, Jessica Kiefte-de Jong

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