@article{articlee9a9d635,
title   = {Diagnostic reference levels for the most frequent radiological examinations carried out in Brazil},
author = {Freitas, Marcelo Baptista and Yoshimura, Elisabeth Mateus},
year = {2009},
doi = {10.1590/s1020-49892009000200001},
journal   = {Revista Panamericana de Salud Pública}
}