P. D. Sørensen, R. F. Andersen, N. Pallisgaard, J. S. Madsen, E. H. Jakobsen, and I. Brandslund, “Quantification of Cell-Free HER-2 DNA in Plasma from Breast Cancer Patients: Sensitivity for Detection of Metastatic Recurrence and Gene Amplification”, J Circ Biomark, vol. 4, no. 1, Aug. 2015.