STEINECK, Gunnar; HUNT, Hayley; ADOLFSSON, Jan. A hierarchical step-model for causation of bias-evaluating cancer treatment with epidemiological methods. Acta Oncologica, [S. l.], v. 45, n. 4, p. 421–429, 2006. DOI: 10.1080/02841860600649293. Disponível em: https://medicaljournalssweden.se/actaoncologica/article/view/27473. Acesso em: 22 feb. 2025.