I need two mammography datasets sourced by different counties or institutions where images are similar to each other.
I'm reading the International evaluation of an AI system for breast cancer screening released by google Jan-2020
PDF paper: https://www.nature.com/articles/s41586-019-1799-6.epdf?author_access_token=V_LKV2xpSv9G1dhANYeWM9RgN0jAjWel9jnR3ZoTv0M5zwPVx5jT4z_z-YkUZTBT6_1AtRXi8QouJM7xB-oSN-cVBoH7f_QTgx-yQN3UBEVfkvO1_5urNT-CZHGCEQNGlCuO69tMQYak4SmdoDqyzg%3D%3D
They used two datasets. One from the UK (OPTIMAM) which needs permission for use. The other from Northwestern Medicine which again needs permission to use.
Are there publicly available datasets that resemble the two above mentioned datasets? especially the OPTIMAM?