RT Journal Article SR Electronic T1 Negative cytology preceding cervical cancer: causes and prevention. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 188 DO 10.1136/jcp.47.2.188-a VO 47 IS 2 A1 C A Rubio YR 1994 UL http://jcp.bmj.com/content/47/2/188.1.abstract AB