1. Department of General Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330000, Jiangxi Province, P. R. China
2. Jiangxi Medical College, Nanchang University, Nanchang 330006, Jiangxi Province, P. R. China
3. The Health Centers of Fengzhou Town, Quanzhou 36200, Fujian Province, P. R. China