title: Effect of pre- and postoperative parenteral nutrition on the nitrogen balance following major surgery.
mesh_terms: D000368:Aged; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000601:surgery; D006493:Heparin; D006801:Humans; D008297:Male; D009584:Nitrogen / Q000378:metabolism*; D010288:Parenteral Nutrition; D011182:Postoperative Care; D011300:Preoperative Care; D011506:Proteins; D014882:Water-Electrolyte Balance
chemical_list: D011506:Proteins; D006493:Heparin; D009584:Nitrogen