RT Journal Article SR Electronic T1 Hormone therapy study restokes debate over breast cancer risk JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1088 OP E1089 DO 10.1503/cmaj.1095815 VO 191 IS 39 A1 Lauren Vogel YR 2019 UL http://www.cmaj.ca/content/191/39/E1088.abstract