For patients with available upper abdomen computed tomographies skeletal muscle index at L3 will be calculated with the software SliceOmatic V5.0 software, Tomovision, Montreal, PQ. In addition, patients' nutritional risk or nutritional status will be assessed through several previously validated tools like the Subjective Global Assessment, the Royal Free Hospital Global assessment scheme and Liver Disease Undernutrition Screening Tool, the efficacy of which will be tested in the present study. Patients will be also categorized according to ESPEN's recent malnutrition diagnostic criteria.