1. Department of Oncological Surgery, First Affiliated Hospital of Jiamusi University, Jiamusi, China
2. Department of Pathology, First Affiliated Hospital of Jiamusi University, Jiamusi, China
3. Department of Galactophore, The First Hospital of Qiqihar, Qiqihar, China
4. Department of Galactophore, Affiliated Qiqihar Hospital, Southern Medical University, Qiqihar, China