ALB and chronic obstructive pulmonary disease: Age, esophageal cancer with gastrointestinal mesenchymal stromal tumor, male, diabetes mellitus, respiratory distress, preoperative ADL, COPD, preoperative pneumonia, peripheral vascular disease, stroke, weight loss>10%, Brinkman>600, creatinine >1.2, albumin <3.8 g/L, ALP>600U/L, blood urea nitrogen >20 mg/dL, PT <10 s