Malnutrition / Humans / Hospitalization / Female / Male / Nutritional Status / Body Mass Index / Adult / Bovine Serum Albumin / Sensitivity and Specificity / Reference Values / Cross Sectional Studies / Enteral Nutrition / Nutritional Status / Body Mass Index / Adult / Bovine Serum Albumin / Sensitivity and Specificity / Reference Values / Cross Sectional Studies / Enteral Nutrition