1. Department of Minimally Invasive Surgery, The First Affiliated Hospital of Liaoning Medical University, Jinzhou, People's Republic of China.
2. Department of Ultrasound, The First Affiliated Hospital of Liaoning Medical University, Jinzhou, People's Republic of China.
3. Department of Hepatobiliary Surgery, The First Affiliated Hospital of Liaoning Medical University, Jinzhou, People's Republic of China.