Adjunctive use of Saccharomyces boulardii versus bismuth subsalicylate in the management of non-Clostridioides difficile nosocomial diarrhea in severely ill patients: a three-arm randomized controlled trial - Preechakawin, Nutchanun; Suttikulsombat, Mets; Kiratisin, Pattarachai; Weeranawin, Pubet; Maneerattanaporn, Monthira (Translational Gastroenterology and Hepatology, 2026)