1. Division of Breast Surgery, IEO European Institute of Oncology IRCCS , Milan , Italy
2. Department of Surgery, Yonsei University College of Medicine , Seoul , Korea
3. Division of Breast Surgery, Department of Surgery, Samsung Medical Centre, Sungkyunkwan University School of Medicine , Seoul , Korea
4. Department of Surgery, Uijeongbu Eulji Medical Centre, Eulji University , Gyeonggi-do 10285 , Korea
5. Data Management, IEO European Institute of Oncology IRCCS , Milan , Italy
6. Division of Epidemiology and Biostatistics, IEO European Institute of Oncology IRCCS , Milan , Italy
7. Breast Unit, Department of Surgery, Ospedale Maggiore di Lodi , Lodi , Italy
8. Division of Breast Surgery, Candiolo Cancer Institute, FPO-IRCCS , Candiolo, Turin , Italy
9. Department of Oncology and Hematology, University of Milan School of Medicine , Milan , Italy