1IBCSG Statistical Center, Dana-Farber Cancer Institute, 44 Binney Street, Boston, MA 02115, USA
2Harvard School of Public Health, Boston, MA, USA
3Department of Medicine, European Institute of Oncology, Milan, Italy
4Oncology Institute of Southern Switzerland, Bellinzona, Switzerland
5Frontier Science and Technology Research Foundation, Boston, MA, USA
6Research Unit in Medical Senology, Department of Medicine, European Institute of Oncology, Milan, Italy
7Department of Oncology, Ospedale Infermi Rimini, Italy
8Istituto Scientifico Romagnolo per lo studio e la cura dei Tumori, Meldola (FC), Italy
9Oncologia Medica-Spedali Civili, Brescia, Italy
10Waikato Hospital, Hamilton, New Zealand
11Harvard Medical School, Boston, MA, USA
12Materials and Surface Science Institute, University of Limerick, Limerick, Ireland