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 S de Sanjose A1 F X Bosch A1 L A Tafur A1 C M Nascimento A1 I Izarzugaza A1 A Izquierdo A1 A Barricarte A1 K V Shah A1 C J L M Meijer A1 N Muñoz YR 2003 UL http://sti.bmj.com/content/79/4/348.abstract AB