Aromatase inhibitors versus tamoxifen in premenopausal women with oestrogen receptor-positive early-stage breast cancer treated with ovarian suppression: patient level meta-analysis of 7,030 women in four randomised trials
BRADLEY R., BRAYBROOKE J., GRAY R., HILLS R., LIU Z., PAN H., Peto R., DODWELL D., MCGALE P., HOWARD C.