1. Department of Gastrointestinal Surgery Heji Hospital Affiliated to Changzhi Medical College Changzhi Shanxi 046011 China
2. Department of Laparoscopic Surgery Heji Hospital Affiliated to Changzhi Medical College Changzhi Shanxi 046011 China
3. Department of Thoracic Surgery Heji Hospital Affiliated to Changzhi Medical College Changzhi Shanxi 046011 China