1. Department of Vascular Surgery, The Second Affiliated Hospital of Qiqihar Medical College, Qiqihar, Heilongjiang, China
2. Department of Vascular Surgery, Heilongjiang Provincial Hospital, Harbin, Heilongjiang, China
3. Department of Vascular Surgery, The First Hospital of Qiqihar, Qiqihar, Heilongjiang, China
4. Department of Vascular Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China