@article{articlea76be29c,
title   = {Vascular endothelial growth factor and β-human chorionic gonadotropin are associated with trophoblastic invasion into the tubal wall in ectopic pregnancy},
author = {Cabar, Fabio Roberto and Pereira, Pedro Paulo and Schultz, Regina and Francisco, Rossana Pulcineli and Zugaib, Marcelo},
year = {2010},
doi = {10.1016/j.fertnstert.2009.10.036},
journal   = {Fertility and sterility}
}