Efficacy of adjuvant trastuzumab in women with HER2-positive T1a or bN0M0 breast cancer: a population-based cohort study oleh Sanji Ali, Jace Hendry, Duc Le, Prosanta K. Mondal, Amer Sami, Haji Chalchal, Kamal Haider, Osama Ahmed, Ali El-Gayed, Philip Wright, Mehrnoosh Pauls, Kate Johnson, Shahid Ahmed