RT Journal Article SR Electronic T1 Pseudomembranous colitis: multiple relapses after treatment with metronidazole JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1603 OP 1605 VO 124 IS 12 A1 D. Portnoy A1 A. Soneji A1 D. Murray A1 G. K. Richards YR 1981 UL http://www.cmaj.ca/content/124/12/1603.abstract