Handheld portable ultrasound as an affordable alternative in resource-limited countries: A single-center observational study. Revista de la Sociedad Ecuatoriana de Nefrología, Diálisis y Trasplante, [S. l.], v. 14, n. 1, p. 30–38, 2025. DOI: 10.56867/121. Disponível em: https://rev-sen.ec/index.php/revista/article/view/121. Acesso em: 25 apr. 2026.