1. Department of Pathology and Laboratory Medicine; University of Cincinnati College of Medicine; Cincinnati; OH; USA
2. Department of Biomedical Sciences and Human Oncology; Clinica Medica “A. Murri”; University of Bari Medical School; Bari; Italy
3. Division of Gastroenterology and Hepatology; Department of Internal Medicine; Saint Louis University School of Medicine; St. Louis; MO; USA