1 Department of Internal Medicine, Loma Linda University Health, Loma Linda, California, USA.
2 Department of Internal Medicine, VA Loma Linda Healthcare System, Loma Linda, California, USA.
3 Division of Gastroenterology and Hepatology, Department of Internal Medicine, VA Loma Linda Healthcare System, Loma Linda University School of Medicine, Loma Linda, California, USA.
4 Department of Radiology, VA Loma Linda Healthcare System, Loma Linda, California, USA.
5 Department of Internal Medicine, University of California Riverside School of Medicine, Riverside, California, USA.