Department of Surgery St.John Hospital Diósárok 1-3 1125 Budapest Hungary;
Department of Surgery St.John Hospital Diósárok 1-3 1125 Budapest Hungary;
Department of Surgery St.John Hospital Diósárok 1-3 1125 Budapest Hungary;
Department of Surgery St.John Hospital Diósárok 1-3 1125 Budapest Hungary;
Department of Surgery St.John Hospital Diósárok 1-3 1125 Budapest Hungary;
Department of Surgery St.John Hospital Diósárok 1-3 1125 Budapest Hungary;
Sarcopenia; Surgery; Gastrointestinal tumor; Prehabilitation; Obesity; Nutritional therapy;