[1] Yangzhou Univ, Clin Med Coll, Yangzhou, Jiangsu, Peoples R China
[2] Nanjing Med Univ, Sch Clin Med 2, Nanjing, Jiangsu, Peoples R China
[3] Yangzhou Univ, Northern Jiangsu Peoples Hosp, Yangzhou 225000, Peoples R China
[4] Xuzhou Med Univ, Yangzhou Clin Coll, Xuzhou 221000, Peoples R China
[5] Yangzhou Univ, Northern Jiangsu Peoples Hosp, Inst Gen Surg, Dept Gen Surg, Yangzhou 225000, Peoples R China
[6] Nanjing Univ, Northern Jiangsu Peoples Hosp, Clin Teaching Hosp, Med Sch, Nanjing 210000, Peoples R China