@misc{misc4f221d15,
title   = {Distribution of serum levels of alphafetoprotein, beta subunit of human chorionic gonadotropin and unconjugated estriol between 14 and 19 weeks of pregnancy in normal gestations in the city of Ribeirão Preto, São Paulo, Brazil},
author = {Patta, Maristela Carbol and Duarte, Geraldo and Pina Neto, João Monteiro de and Machado, J. C. and Cunha, Sérgio Pereira da and Berezowski, Aderson Tadeu},
year = {2000},
booktitle   = {International Congress the Fetus as a Patient}
}