Expression of Concern : Blockchain-Powered Dynamic Segmentation in Personal Health Record. Mesopotamian Journal of CyberSecurity, [S. l.], v. 2026, n. 1, p. 15–15, 2026. DOI: 10.58496/2026/015. Disponível em: https://mesopotamian.press/journals/index.php/CyberSecurity/article/view/1039. Acesso em: 28 feb. 2026.