@article{Varea2012,
author = {Varea, Carlos and Bernis, Cristina and González González, Antonio },
title= {Maternal Characteristics and Temporal Trends in Birth Outcomes: Comparison between Spanish and Migrant Mothers},
year = {2012},
doi = {10.1155/2012/412680},
journal = {International Journal of Population Research},
volume = {2012},
pages = {8},
}