@article{articled9012144,
title   = {Affordability of cataract surgery using the Big Mac prices},
author = {Lansingh, Van C. and Carter, Marissa J. and Eckert, Kristen A. and Winthrop, Kevin L. and Furtado, João Marcello Fortes and Resnikoff, Serge},
year = {2015},
doi = {10.1016/j.mexoft.2014.07.001},
journal   = {Revista Mexicana de Oftalmología}
}