Development and validation of an early warning score to identify COVID-19 in the emergency department based on routine laboratory tests: a multicentre case–control study by Volkher Scharnhorst, Madelon M Buijs, Heidi S M Ammerlaan, Arjen-Kars Boer, Ruben Deneer, Maaike Maas, Roland H H van Balkom, Wendy A H M Thijssen, Sophie Bennenbroek, Mathie Leers, Remy J H Martens, Jos J Kerremans, Muriël Messchaert, Jeroen J van Suijlen, Natal A W van Riel

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