Study to Assess the Clinical Efficacy of the Specialized Enteral Tube Nutrition Composition Nutrison Advanced Cubison as a Part of Complex Pressure Ulcers (PU) Therapy

(20% protein energy 100 kcal, 5.5 g protein, 0.85 g arginine, 38 mg of vitamin C and 2 mg of zinc) in a volume not exceeding 1.5 liters / day and, if necessary, to replenish nutritional needs based on the total daily intake of 30-35 kcal / kg / day and 1.2-1.5 g of protein / kg body weight / day according to the recommendations for nutritional support