@article{Betrán2001,
author = {Betrán, A.P. and Onís, M. D. and Lauer, J.A. and Villar, J.},
title= {Ecological study of effect of breast feeding on infant mortality in Latin America},
year = {2001},
doi = {10.1136/bmj.323.7308.303},
journal = {BMJ},
volume = {323},
pages = {1--5},
}