1 Hebei General Hospital (Department of Gastrointestinal Surgery), Shijiazhuang, Hebei, 050051, PR China; Hebei North University (School of Clinical Medicine), Zhangjiakou, Hebei, 075031, PR China.
2 Hebei General Hospital (Department of Gastrointestinal Surgery), Shijiazhuang, Hebei, 050051, PR China.
3 Hebei General Hospital (Department of Hepatobiliary Surgery), Shijiazhuang, Hebei, 050051, PR China. Electronic address: wenjunyan6@163.com.