Statistics for A primary extended cytoreductive surgery for ovarian cancer: total abdominal hysterectomy and bilateral salpingo-oophorectomy, total omentectomy, total peritonectomy, bilateral diaphragm stripping, cholecystectomy, total colectomy, splenectomy, bilateral pelvic-paraaortic lymphadenectomy, dissection of porta hepatis, liver metastasectomy, and bilateral cardiophrenic lymphadenectomy