1. Department of Breast Surgery, Qilu Hospital, Shandong University, Jinan, Shandong 250012, P.R. China
2. Department of Breast Surgery, General Hospital of Chinese Armed Police Force, Beijing 100039, P.R. China
3. Department of Pathology Tissue Bank, Qilu Hospital, Shandong University, Jinan, Shandong 250012, P.R. China