Nosocomial bronchopneumonia in the critically ill. Histologic and bacteriologic aspects - Rouby,J.J.; Martin de Lassale,E.; Poete,P.; Nicolas,M.H.; Bodin,L.; Jarlier,V.; LeCharpentier,Y.; Grosset,J.; Viars,P. (Am Rev Respir Dis, 1992)