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*Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical Univerisity,
Beijing, People's Republic of China†Department of General Surgery, Peking University
Third Hosptial, Beijing, People's Republic of China‡Department of General Surgery,
Shanxi Provincial People's Hospital, Shaanxi, People's Republic of China§Department
of General Surgery, The First Affiliated Hospital of the School of Medicine Xi An
Jiaotong University, Shaanxi, People's Republic of China¶Department of General Surgery,
Tianjin Third Central Hospital, Tianjin, People's Republic of China.