viagra time to work The ATAC trial was a randomized 1 1 1, double blind trial of the adjuvant use of anastrozole 1 mg versus tamoxifen 20 mg versus the combination for 5 years
viagra time to work The ATAC trial was a randomized 1 1 1, double blind trial of the adjuvant use of anastrozole 1 mg versus tamoxifen 20 mg versus the combination for 5 years
