RT Journal Article SR Electronic T1 Advances in infectious diseases JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 254 OP 255 DO 10.7861/clinmedicine.9-3-254 VO 9 IS 3 A1 Chris Ellis YR 2009 UL http://www.rcpjournals.org/content/9/3/254.abstract