Efficacy of inter scalene regional block in shoulder surgery: A single-center observational study. Actas Médicas (Ecuador), [S. l.], v. 33, n. 1, p. 38–43, 2023. DOI: 10.61284/84. Disponível em: https://actasmedicas.ec/index.php/am/article/view/84.. Acesso em: 19 apr. 2026.