1 Department of General Surgery, Yangpu Hospital, Tongji University School of Medicine, Shanghai, China.
2 Diagnostic and Treatment Center for Refractory Diseases of Abdominal Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China.
3 Diagnostic and Treatment Center for Refractory Diseases of Abdominal Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China. Electronic address: chenchunqiu6@126.com.