Association of Unobserved Heterogeneity & Observed Factors with Survival Time of Pediatric Cardiac Patients: A Frailty Model Analysis. International Journal of Medicine & Health Research (IJMHR) (ISSN 2395-3586) , [S. l.], v. 14, n. 2, p. 1–11, 2026. DOI: 10.71393/fg5ada85. Disponível em: https://www.internationalmedicalpublishing.com/index.php/IJMHR/article/view/342. Acesso em: 3 oct. 2026.