1 Division of Gastroenterology and Hepatology, Johns Hopkins Hospital, Baltimore, Maryland, USA; Department of Medicine, Marmara University School of Medicine, Istanbul, Turkey.
2 Division of Gastroenterology and Hepatology, Johns Hopkins Hospital, Baltimore, Maryland, USA; Department of Gastroenterology, Saint George Hospital, Sydney, Australia.
3 Department of Pathology, Johns Hopkins Hospital, Baltimore, Maryland, USA.
4 Division of Gastroenterology and Hepatology, Johns Hopkins Hospital, Baltimore, Maryland, USA.