THORNGREN, Karl-Göran. National registration of hip fractures. Acta Orthopaedica, [S. l.], v. 79, n. 5, p. 580–582, 2008. DOI: 10.1080/17453670810016579. Disponível em: https://actaorthop.org/actao/article/view/18946. Acesso em: 27 apr. 2026.