Is the inhibition of nocturnal gastric acid secretion the most important factor in duodenal ulcer treatment? a comparison between the effectiveness of single morning and nocte doses of ranitidine 300 mg - Zaterka, S; Massuda, H K; Eisig, J N; Chinzon, D; Bettarello, Agostinho (Revista do Hospital das Clinicas da Faculdade de Medicina da Universidade de Sao Paulo, 1989)