1. Department of Pathology and Anatomical Sciences; University of Missouri; Columbia Missouri
2. Department of Pathology; Fox Chase Cancer Center; Philadelphia Pennsylvania
3. Laboratory of Pathology; National Cancer Institute; Bethesda Maryland
4. The Sol Goldman Pancreatic Cancer Research Center; The Johns Hopkins University School of Medicine; Baltimore Maryland
5. Department of Pathology and Laboratory Medicine; the Hospital of the University Of Pennsylvania; Philadelphia Pennsylvania
6. The Department Of Pathology; the University of Chicago; Chicago Illinois
7. Institut Gustave Roussy; Villejuif France
8. Department of Pathology; the Massachusetts General Hospital, Harvard University; Boston Massachusetts