Glutamine supplementation of parenteral nutrition does not improve intestinal permeability, nitrogen balance, or outcome in newborns and infants undergoing digestive-tract surgery: results from a double-blind, randomized, controlled trial. - Albers,M.; Steyerberg,E.; Hazebroek,F.; Mourik,M.; Borsboom,G.; Rietveld,T.; Huijmans,J.; Tibboel,D. (Ann Surg, 2005)