@article{article727b7b22,
title   = {Analyses of cataract surgery performed by the Unified Health System in Brazil, 2006-2007},
author = {Caligaris, Ligia Santos Abreu and Medina, Norma Helen and Lansingh, Van C and Waldman, Eliseu Alves and Yaacov-Peña, Fernando},
year = {2011},
doi = {10.1590/S1020-49892011000600008},
journal   = {Revista Panamericana de Salud Pública}
}