RT Journal Article SR Electronic T1 NICE guidance and the National Chlamydia Screening Programme JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 170 OP 170 DO 10.1136/sti.2007.025114 VO 83 IS 2 A1 Judith Stephenson YR 2007 UL http://sti.bmj.com/content/83/2/170.abstract AB