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Pagani, O; Gelber, S; Simoncini, E; Castiglione Gertsch, M; Price, Kn; Gelber, Rd; Holmberg, Sb; Crivellari, D; Collins, J; Lindtner, J; Thürlimann, B; Fey, Mf; Murray, E; Forbes, Jf; Coates, As; Goldhirsch, A; . ., .; Grigolato, Pier Giovanni; International Breast Cancer Study, Group