RT Journal Article SR Electronic T1 Human leukocyte antigen B27 JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 162 OP 163 DO 10.7861/clinmedicine.10-2-162 VO 10 IS 2 A1 Roger D Sturrock YR 2010 UL http://www.rcpjournals.org/content/10/2/162.abstract