1. Division of Breast Surgery European Institute of Oncology, IRCCS Milan Italy
2. Department of Oncology and Hemato‐Oncology University of Milan Milan Italy
3. Department of Statistics and Quantitative Methods University of Milan‐Bicocca Milan Italy
4. Division of Medical Senology European Institute of Oncology, IRCCS Milan Italy
5. Division of Pathology European Institute of Oncology, IRCCS Milan Italy