<style face="normal" font="default" size="100%">COVID-19 hospital outbreaks: Protecting healthcare workers to protect frail patients. An Italian observational cohort study</style>

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0<style face="normal" font="default" size="100%">COVID-19 hospital outbreaks: Protecting healthcare workers to protect frail patients. An Italian observational cohort study</style><style face="normal" font="default" size="100%">COVID-19 hospital outbreaks: Protecting healthcare workers to protect frail patients. An Italian observational cohort study</style>