@article{article407b27c3,
title   = {Sexual activity among female teenagers: a comparison between two groups of middle class adolescents from a private clinic according to pregnancy status},
author = {Faisal-Cury, Alexandre and Menezes, Paulo Rossi},
year = {2008},
doi = {10.1590/s1519-38292008000300003},
journal   = {Revista Brasileira de Saúde Materno Infantil}
}