4Rutgeerts P,Peeters M,Hiele M,et al. A placebo controlled trial of metronidazole for recurrence prevention of Cronh's disease after resection of the terminal ileum. Gastroenterology, 1992, 102(4) :A688.
5Selby WS,Barr GD,Ireland A,et al. Olsalazine in active ulcerative colitis. Br Med J, 1985,291(6506): 1373.