Charlson comorbidity index has no incremental value for mortality risk prediction in nursing home residents with COVID-19 disease by Anum Zahra, Maarten van Smeden, Petra J. M. Elders, Jan Festen, Jacobijn Gussekloo, Karlijn J. Joling, Anouk van Loon, Kim Luijken, René J. F. Melis, Simon P. Mooijaart, Karel G. M. Moons, Geeske Peeters, Harmke A. Polinder-Bos, Fenne Wouters, Anne de Hond

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