El-Serag Hashem, Lok Anna S F, Thomas David L
Gastroenterology and Hepatology Section, Clinical Epidemiology and Outcomes Division, Baylor College of Medicine, Houston, Texas 77584, USA.
Gastroenterology. 2010 Apr;138(4):1225-30, 1230.e1-3. doi: 10.1053/j.gastro.2010.02.034. Epub 2010 Feb 19.