A Prospective Randomized Trial of Sclerotherapy Versus Ligation in the Elective Treatment of Bleeding Esophageal Varices - Barboncini, D; Milandri, G L; Borioni, D; Piemontese, A; Cennamo, V; Billi, P; Dal Monte, P P; D'Imperio, N (Endoscopy, 1997)