Open necrosectomy combined with continuous positive drainage and prophylactic diverting loop ileostomy for late infected pancreatic necrosis: a retrospective cohort study oleh Dong-Guang Niu, Wei-Qin Li, Qian Huang, Fan Yang, Wei-Liang Tian, Chen Li, Lian-An Ding, Hong-Chun Fang, Yun-Zhao Zhao