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1. Machine learning risk prediction of mortality for patients undergoing surgery with perioperative SARS-CoV-2: The COVIDSurg mortality score
2. Analyzing central-line associated bloodstream infection prevention bundles in 22 countries: The results of ID-IRI survey
3. Epidemiology and impact of frailty in patients with atrial fibrillation in Europe
4. Impact of Bacillus Calmette-Gue´rin (BCG) vaccination on postoperative mortality in patients with perioperative SARS-CoV-2 infection
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