KULTANGWATTANA, W. Bedside ultrasonography with nasogastric air insufflation for diagnosis of non-free air peptic ulcer perforation : A Pilot Study. Region 11 Medical Journal, [S. l.], v. 36, n. 1, 2022. DOI: 10.14456/reg11med.2022.5. Disponível em: https://he02.tci-thaijo.org/index.php/Reg11MedJ/article/view/255897. Acesso em: 20 sep. 2026.