Author Correction: Impact of hormone receptor status and distant recurrence-free interval on survival benefits from trastuzumab in HER2-positive metastatic breast cancer. - Yang, Hai-Yuan; Ma, Ding; Liu, Yi-Rong; Hu, Xin; Zhang, Jian; Wang, Zhong-Hua; Di, Gen-Hong; Hu, Xi-Chun; Shao, Zhi-Ming (Scientific Reports, 2018)