RT Journal Article SR Electronic T1 Clearance of HPV infection in middle aged men and women after 9 years’ follow up JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 348 OP 348 DO 10.1136/sti.79.4.348 VO 79 IS 4 A1 de Sanjose, S A1 Bosch, F X A1 Tafur, L A A1 Nascimento, C M A1 Izarzugaza, I A1 Izquierdo, A A1 Barricarte, A A1 Shah, K V A1 Meijer, C J L M A1 Muñoz, N YR 2003 UL http://sti.bmj.com/content/79/4/348.abstract AB