ABDULLAH, Rebar Yahya. An Overview of Research Study Designs: Methodological Principles and Applications. Health Innovation Reports, Erbil, Iraq, v. 2, n. 1, p. 24–31, 2026. DOI: 10.64048/hir.v2n1.006. Disponível em: https://healthinnovationpress.com/index.php/hir/article/view/hir-v2n1-006. Acesso em: 27 jun. 2026.