Influence of intestinal bacterial decontamination using metronidazole and ciprofloxacin or ciprofloxacin alone on the development of acute graft-versus-host disease after marrow transplantation in patients with hematologic malignancies: final results and long-term follow-up of an open-label prospective randomized trial. - Beelen,D.W.; Elmaagacli,A.; Muller,K.D.; Hirche,H.; Schaefer,U.W. (Blood, 1999)