@article{Villalbí2007,
author = {Villalbí, Joan R. and Salvador, Joaquin and Cano-Serral, Gemma and Rodríguez-Sanz, Maica C. and Borrell, Carme},
title= {Maternal smoking, social class and outcomes of pregnancy},
year = {2007},
doi = {10.1111/j.1365-3016.2007.00845.x},
journal = {Paediatric and Perinatal Epidemiology},
volume = {21},
number = {5},
pages = {441--447},
}