Erratum to: Breast Cancer Res Treat (2016) 155:501–512 DOI 10.1007/s10549-016-3710-6

In the original publication of the article, the calcium carbonate supplement was published incorrectly. The correct amount of calcium carbonate taken by all study participants was 500 mg/day for the study period of 7 month (includes the 1 month run-in period). The authors apologize for this error.