1. Department of Thoracic Surgery, The First Affiliated Hospital of Jiamusi University, Jiamusi 154002, China
2. Department of Thoracic Surgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China
3. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Jiamusi University, Jiamusi 154002, China
4. Department of General Surgery, The First Affiliated Hospital of Jiamusi University, Jiamusi 154002, China