SOD1 and pancreatitis: Chen et al. have reported in a meta-analysis of 13 studies involving 32,381 post-ERCP patients that female gender, previous PEP, previous pancreatitis, endoscopic sphincterotomy, precut sphincterotomy, sphincter of Oddi dysfunction (SOD), and non-prophylactic pancreatic duct stent are significantly associated with an increased risk of PEP [12].