Black Esophagus and Recurrence of Duodenal Ulcers: Two Signs of the Same Pathogenic Pathway? A Case Report. - Balducci, Daniele; Quatraccioni, Claudia; Daretti, Luigi Maria; Montori, Michele; Bendia, Emanuele; Maroni, Luca; Benedetti, Antonio (Reports (MDPI AG), 2023)