1. Department of Radiology, Mayo Clinic School of Medicine, Rochester, MN, USA;
2. Cell Signaling Technology, Inc. 3 Trask Ln. Danvers, MA, USA;
3. Department of Laboratory Medicine and Pathology, Mayo Clinic School of Medicine, Rochester, MN, USA;
4. Division of Gastroenterology and Hepatology, Mayo Clinic School of Medicine, Rochester, MN, USA