1. Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi`an Jiaotong University, Xi`an, Shaanxi, China
2. Department of General Surgery, The Second Affiliated Hospital of Xi’an Jiaotong University, Xi`an, Shaanxi, China
3. Department of Neurosurgery, The First Affiliated Hospital of Xi`an Jiaotong University, Xi`an, Shaanxi, China
4. Department of Oncology, The First Affiliated Hospital of Xi`an Jiaotong University, Xi`an, Shaanxi, China
5. Department of Thoracic Surgery, The Second Affiliated Hospital of Xi`an Jiaotong University, Xi`an, Shaanxi, China
6. Department of Nephrology, The First Affiliated Hospital of Xi`an Jiaotong University, Xi`an, Shaanxi, China