1. Medical Oncology and Breast Unit, University Hospital of Parma, 43126 Parma, Italy
2. Department of Medicine and Surgery, University of Parma, 43121 Parma, Italy
3. GOIRC (Gruppo Oncologico Italiano di Ricerca Clinica), 43100 Parma, Italy
4. Medical Oncology, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milano, Italy
5. Medical Oncology, AOU Cagliari, Policlinico Duilio Casula, 09042 Monserrato, Italy
6. Medical Oncology, University of Cagliari, 09124 Cagliari, Italy
7. Pathological Anatomy, Laboratory Valdès, 81200 Cagliari, Italy
8. Academic Medical Centre, Amsterdam University Medical Center, University of Amsterdam, 1098 XH Amsterdam, The Netherlands