1. Department of Pathology and Laboratory Medicine; University of Texas Health Science Center at Houston; McGovern Medical School, and Memorial Hermann Hospital-TMC; Houston TX USA
2. Department of Pathology; Baylor College of Medicine; Houston TX USA
3. Department of Anatomic Pathology; H. Lee Moffitt Cancer Center; Tampa FL USA
4. Section of Gastroenterology; Department of Medicine; Houston Methodist Hospital; Houston TX USA
5. Section of Gastroenterology, Hepatology and Nutrition; Department of Medicine; University of Texas Health Science Center at Houston; McGovern Medical School, and Memorial Hermann Hospital-TMC; Houston TX USA