Biliary Tract Diseases/complications; Pancreatitis/etiology; Peritonitis/complications; Shock, Septic/etiology; Aged; Biliary Tract Diseases/microbiology; Biliary Tract Diseases/pathology; Citrobacter koseri/isolation & purification; Drainage; Escherichia coli/isolation & purification; Fatal Outcome; Humans; Male; Necrosis; Pancreatitis/microbiology; Pancreatitis/pathology; Pancreatitis/surgery; Patient Selection; Peritonitis/etiology; Peritonitis/microbiology; Peritonitis/pathology; Peritonitis/surgery; Retroperitoneal Space/microbiology; Retroperitoneal Space/pathology; Rupture, Spontaneous; Shock, Septic/microbiology; Shock, Septic/pathology; Shock, Septic/surgery; Time Factors; Tomography, X-Ray Computed