Association of institutional masking policies with healthcare-associated SARS-CoV-2 infections in Swiss acute care hospitals during the BA.4/5 wave (CH-SUR study): a retrospective observational study. - Dörr, Tamara; Güsewell, Sabine; Flury, Domenica; Süveges, Maria; Gaza Valera, Camille Beatrice; Botero-Mesa, Sara; Zanella, Marie-Céline; Iten, Anne; Balmelli, Carlo; Troillet, Nicolas; Tschudin-Sutter, Sarah; W Schreiber, Peter; et al. (Antimicrobial Resistance & Infection Control, 2024)