4Koivula I,Stén M,Makela PH.Prognosis after community-acquired pneumonia in the elderly:a population-basd 12-year follow-up study.Arch Intern Med,1999,159(14):1550-1555.
5Fry AM,Shay DK,Holman RC,et al.Trends in hospitalizations for pneumonia among persons aged 65 years of older in the United States,19882002.JAMA,2005,294(21):2712-2719.
6Awano S,Ansai T,Takata Y,et al.Oral health and mortality risk from pneumonia in the elderly.J Dent Res,2008,87(4):334-339.
7S(a)yn(a)j(a)kangas P,keistinen T,Honkanenn PO,et al.Hospital discharges for pneumonia in Finland between 1972 and 1993 in population aged 65 years or over.Age Ageing,1997,26(4):269-273.
8Mangtani P,Roberts JA,Hall AJ,et al.An economic analysis of a pneumococcal vaccine programme in people aged over 64 years in a developed country setting.Int J Epidemiol,2005,34(3):565-574.
