CRP and chronic obstructive pulmonary disease: APACHE II, Acute Physiology and Chronic Health Evaluation II;<br>COPD, Chronic Obstructive Pulmonary Disease;<br>Cr, C-reactive protein;<br>ICU, Intensive Care Unit;<br>MAP, Mean Arterial Pressure;<br>MBL2, Mannose-Binding Lectin 2;<br>MST, Median Survival Time;<br>NE, Norepinephrine;<br>OR, Odds Ratio;<br>PCT, Procalcitonin;<br>ROC, Receiver Operating Characteristic;<br>Scr, Serum Creatinine;<br>SOFA, Sepsis-Related Organ Failure Assessment;<br>SSC, Surviving Sepsis Campaign;<br>WBC, White Blood Cell.