1. Department of Acute Abdomen Surgery, The Second Hospital of Dalian Medical University, Dalian, Liaoning 116023, P.R. China
2. Department of Breast Surgery and Oncology, The Second Hospital of Dalian Medical University, Dalian, Liaoning 116023, P.R. China
3. Institute of Cancer Stem Cell, Dalian Medical University, Dalian, Liaoning 116044, P.R. China