1. Department of Thoracic Surgery, Second Affiliated Hospital, Medical School, Xi'an Jiaotong University, Shaanxi Province - China
2. Department of Gastroenterology, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province - China
3. Department of Thoracic Surgery, First Affiliated Hospital, Medical School, Xi'an Jiaotong University, Shaanxi Province - China