Conventional echo color Doppler versus ULA-OP in the assessment of venous flow model. Veins and Lymphatics, [S. l.], v. 6, n. 1, 2017. DOI: 10.4081/vl.2017.6841. Disponível em: https://www.pagepressjournals.org/vl/article/view/6841. Acesso em: 20 jun. 2026.