What are the gradings of chronic pancreatitis by ERCP?

Cambridge grading (according to pancreatic duct and side branch involvement. Normal, Equivocal (if main duct normal and <3 side are abnormal), mild (main normal and >3 side are abnormal), moderate (main abnormal and >3 side abnormal), severe (main abnormal with at least one of large cavity (>10mm), obstruction, filling defects, severe dilatation))