RT Journal Article SR Electronic T1 Criteria for undertaking lumbar puncture in the assessment of syphilis. JF Genitourinary Medicine JO Genitourin Med FD BMJ Publishing Group Ltd SP 66 OP 67 DO 10.1136/sti.61.1.66 VO 61 IS 1 A1 P Harper YR 1985 UL http://sti.bmj.com/content/61/1/66.abstract AB