Low-dose tamoxifen in the treatment of breast ductal intraepithelial neoplasia: results of a large observational study - Guerrieri-Gonzaga, A.; Botteri, E.; Lazzeroni, M.; Rotmensz, N.; Goldhirsch, A.; Varricchio, C.; Serrano, D.; Cazzaniga, M.; Bassi, F.; Luini, A.; Bagnardi, V.; Viale, G.; et al. (Annals of Oncology, 2010)