RT Journal Article SR Electronic T1 Variation in risk of second primary cancer JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 19 OP 20 DO 10.1503/cmaj.111424 VO 184 IS 1 A1 Marcy Winget A1 Yutaka Yasui YR 2012 UL http://www.cmaj.ca/content/184/1/19.abstract