RT Journal Article SR Electronic T1 Prevalence of infection with carcinogenic human papillomavirus among older women JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 871 OP 873 VO 167 IS 8 A1 Sellors, John W. A1 Karwalajtys, Tina L. A1 Kaczorowski, Janusz A. A1 Mahony, James B. A1 Lytwyn, Alice A1 Chong, Sylvia A1 Sparrow, Joanna A1 Lorincz, Attila A1 , YR 2002 UL http://www.cmaj.ca/content/167/8/871.abstract