@misc{misc8068723a,
title   = {Cervical lenght distribution in early pregnancy by transvaginal ultrasonography},
author = {Carvalho, M H B and Brizot, Maria de Lourdes and Bittar, Roberto Eduardo and Miyadahira, Seizo and Zugaib, Marcelo},
year = {1998},
booktitle   = {World Congress on Ultrasound in Obstetrics and Gynecology}
}