Variation in treatment and survival of older patients with non-metastatic breast cancer in five European countries: a population-based cohort study from the EURECCA Breast Cancer Group

Derks MGM, Bastiaannet E, Kiderlen M, Hilling DE, Boelens PG, Walsh PM, van Eycken E, Siesling S, Broggio J, Wyld L, Trojanowski M, Kolacinska A, Chalubinska-Fendler J, Gonçalves AF, Nowikiewicz T, Zegarski W, Audisio RA, Liefers GJ, Portielje JEA, et al.