title: Pitfalls in studies of prophylactic therapy for variceal bleeding in cirrhotics.
mesh_terms: D001794:Blood Pressure; D004932:Esophageal and Gastric Varices / Q000150:complications* / Q000503:physiopathology; D006471:Gastrointestinal Hemorrhage / Q000209:etiology / Q000517:prevention & control*; D006801:Humans; D008103:Liver Cirrhosis / Q000150:complications*; D011167:Portacaval Shunt, Surgical; D011168:Portal System / Q000503:physiopathology; D011379:Prognosis; D012107:Research Design; D012306:Risk