The collection of X-ray absorption spectroscopy (XAS) data was funded by the Australian Synchrotron (AS123/XAS5341). We thank Dr. Bernt Johannessen of the Australian Synchrotron and our colleagues Dr. C. Ng and A/Prof. Z. Sun for assistance with XAS data collection. Also, we would like to thank Carolyn Madeley of Breast Assessment Centre, Royal Perth Hospital, Western Australia for giving us the opportunity to use the mammography unit.