Outcome after neoadjuvant chemotherapy in young breast cancer patients: a pooled analysis of individual patient data from eight prospectively randomized controlled trials - Loibl, Sibylle; Jackisch, Christian; Lederer, Bianca; Untch, Michael; Paepke, Stefan; Schneeweiss, Andreas; Huober, Jens; Gerber, Bernd (Breast cancer research and treatment, 2015)