- Participants with documented diagnosis of CP by medical history and it is preferred that it is supported by imaging evidence confirming CP which include: abnormal endoscopic retrograde cholangio-pancreatography (ERCP) (Cambridge Class 4), abnormal computed tomography (CT) scan (dilated main pancreatic duct, atrophy of the pancreas or calcification), abnormal ultrasound, or endoscopic ultrasound with at least 5 abnormalities noted