1. Breast Disease Center, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
2. Department of Oncology, The Second Affiliated Hospital of Medical College of Qingdao University, Qingdao, Shandong 266000, P.R. China
3. Department of Oncology, The PLA Navy Anqing Hospital, Anqing, Anhui 246000, P.R. China