RT Journal Article SR Electronic T1 Monitoring of lymphocyte subpopulation changes in the assessment of HIV infection. JF Genitourinary Medicine JO Genitourin Med FD BMJ Publishing Group Ltd SP 133 OP 137 DO 10.1136/sti.66.3.133 VO 66 IS 3 A1 A G Bird YR 1990 UL http://sti.bmj.com/content/66/3/133.abstract AB