RT Journal Article SR Electronic T1 Clostridium difficile infection JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 544 OP 547 DO 10.7861/clinmedicine.8-5-544 VO 8 IS 5 A1 Tristan Clark A1 Martin Wiselka YR 2008 UL http://www.rcpjournals.org/content/8/5/544.abstract AB