4Rabe KF,Hurd S.Global strategy for the diagnosis,management,and prevention of chronic obstructive pulmonary disease:GOLD executive summary.Am J Respir Crit Care Med,2007,176(6):532-555.
7Garcia Vicente E, Sandoval Almengor JC, Dlaz Caballero L'A, et al. Inva- sive mechanical ventilation in COPD and asthma. Med Intensiva, 2011, 35:288-298.
8Aldrich MC, Munro HM, Mumma M, et al. Chronic Obstructive Pulmonary Disease and Subsequent Overall and Lung Cancer Mortality in Low-In- come Adults. PLoS One, 2015,10: e0121805.
9Bansal M, Khatri M, Taneja V. Potential role of periodontal infection in respiratory diseases-a review. J Med Life ,2013,6:244-248.