Gallstone ileus: a case report of small bowel obstruction. - Antzoulas A; Theofanis G; Andrikopoulou C; Leivaditis V; Litsas D; Papadopoulos PD; Tasios K; Panagopoulos A; Skoura T; Miteva N; Maroulis I; Mulita F (Przeglad gastroenterologiczny, 2026)