ORIGINAL INVESTIGATION: Mortality and Need for Mechanical Ventilation in Acute Exacerbations of Chronic Obstructive Pulmonary Disease: Development and Validation of a Simple Risk Score

Y. P Tabak, X Sun, R. S Johannes, V Gupta and A. F. Shorr

Archives of Internal Medicine 169 ( 17 ): 1595 - 1602 , 2009