Retention of mouth-to-mouth, mouth-to-mask and mouth-to-face shield ventilation
P Paal, M Falk, E Gruber, W Beikircher, G Sumann, F Demetz, J Ellerton, V Wenzel, H Brugger
Emergency Medicine Journal Jan 2008, 25 (1) 42-45; DOI: 10.1136/emj.2007.050229