@misc{misc25c29aaf,
title   = {The use of natural progesterone in prevention of preterm delivery in high risk women for preterm birth},
author = {Fonseca, E and Bittar, Roberto Eduardo and Damião, R and Moraes, A and Zugaib, Marcelo},
year = {2000},
booktitle   = {World Congress of Gynecology and Obstetrics}
}