Ulrich Eickhoff

Outcome and cost-effectiveness of perioperative enteral immunonutrition in patients undergoing elective upper gastrointestinal tract surgery: a prospective randomized study.

A. Frei, G. Wolfram, M. Senkal, 1999, Archives of surgery.

Early postoperative enteral immunonutrition: clinical outcome and cost-comparison analysis in surgical patients.

U. Joosten, B. Geier, A. Mumme, 1997, Critical care medicine.