RT Journal Article SR Electronic T1 Ulcerative colitis presenting as pyrexia of unknown origin (PUO) without bowel symptoms JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 112 OP 113 DO 10.7861/clinmedicine.13-1-112a VO 13 IS 1 A1 Graham Johnston YR 2013 UL http://www.rcpjournals.org/content/13/1/112.2.abstract