[1]Fudan Univ, Zhongshan Hosp, Endoscopy Res Inst, Shanghai, Peoples R China;
[2]Fudan Univ, Zhongshan Hosp, Endoscopy Ctr, Shanghai, Peoples R China;
[3]Fudan Univ, Thorac Surg Res Inst, Zhongshan Hosp, Shanghai, Peoples R China