Baumann, M., S. U. Dani, D. Dietrich, A. Hochstrasser, D. Klingbiel, M. T. Mark, W. F. Riesen, T. Ruhstaller, A. J. Templeton, and B. Thürlimann. “Vitamin D Levels in Swiss Breast Cancer Survivors”. Swiss Medical Weekly, vol. 148, no. 0304, Jan. 2018, p. w14576, doi:10.4414/smw.2018.14576.