FREQUENCY OF AIR UNDER THE DIAPHRAGM IN PATIENTS WITH PERFORATED GASTRIC AND DUODENAL ULCER. Frontier in Medical and Health Research, [S. l.], v. 3, n. 4, p. 1378–1387, 2025. Disponível em: https://fmhr.net/index.php/fmhr/article/view/3807.. Acesso em: 9 oct. 2026.