Comparative study of etiological diagnosis of nosocomial pneumonia - Carvalho, Eliane Maria de; Massarollo, Paulo celso Bosco; Levin, Anna S.; Isern, Maria Rita Montenegro; Pereira, Wilson Leite; Abdala, Edson; Rossi, Flavia; Mies, Sérgio (The Brazilian Journal of Infections Diseases, 2008)