CRP and susceptibility to pneumonia measurement: Relationship between the prevalence of pneumonia and nasogastric tube use; receiving general anesthesia; using loop diuretics; the presence of pulmonary diseases; levels of WBC, ESR, and CRP; results of blood and respiratory cultures; the number of hospitalization and ICU admission in the last six months; RASS score (number of sedation days on and off); and the type of pneumonia