[1] Ningbo First Hosp, Dept Nursing, 59 Liu Ting St, Ningbo 315010, Zhejiang, Peoples R China
[2] Ningbo First Hosp, Dept Thorac Surg, Ningbo 315010, Zhejiang, Peoples R China
[3] Ningbo First Hosp, Dept Gastrointestinal Surg, Ningbo 315010, Zhejiang, Peoples R China