1 Research Institute of Biliary Tract Disease, Affiliated to Shanghai Jiao Tong University, School of Medicine, Shanghai, China; Laboratory of General Surgery and Department of General Surgery, Xinhua Hospital, Affiliated to Shanghai Jiao Tong University, School of Medicine, No. 1665 Kongjiang Road, Shanghai 200092, China.
2 Research Institute of Biliary Tract Disease, Affiliated to Shanghai Jiao Tong University, School of Medicine, Shanghai, China; Laboratory of General Surgery and Department of General Surgery, Xinhua Hospital, Affiliated to Shanghai Jiao Tong University, School of Medicine, No. 1665 Kongjiang Road, Shanghai 200092, China. Electronic address: liuybphd@126.com.