RT Journal Article SR Electronic T1 Pacing predicts leaving work in ankylosing spondylitis JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 852 OP 852 DO 10.1136/oem.59.12.852 VO 59 IS 12 YR 2002 UL http://oem.bmj.com/content/59/12/852.abstract AB