5Feldman C.Pneumonia in the elderly.Med Clin North Am,2001,85(6):1441-1459
6Lieberman D,Lieberman D.Community-acquired pneumonia in the elderly:a practical guide to treatment.Drug Aging,2000,17(2):93-105
7Marrie TJ.Community-acquired pneumonia in the elderly.Clin Infect Dis,2000,31:1066-1078
8Leibovitz A,Plotnikov G,Habot B,et al.Pathogenic colonization of oral flora in frail elderly patients fed by nasogastric tube or percutaneous enterogastric tube.J Gerontol A Biol Sci Med Sci,2003,58:52-55
9Sekizawa K,Sasaki H.High incidence of silent aspiration in elderly patients with community acquired pneumonia.Am J Respir Crit Care Med,1994,150:251-253
10Ewig S,Torres A,Ngeles MMA,et al.Factors associated with unknown etiology in patients with community-acquired pneumonia.Eur Respir J,2002,20:1254-1262
