RT Journal Article SR Electronic T1 Persistently high loads of human papillomavirus 16 over time were associated with an increased risk for cervical cancer JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 30 OP 30 DO 10.1136/ebm.6.1.30 VO 6 IS 1 YR 2001 UL http://ebm.bmj.com/content/6/1/30.abstract AB