@incollection{Sibai12,
author = {Helen Y. How and Baha M. Sibai},
title = {Progestins and Preterm Birth},
booktitle = {Preterm Birth},
publisher = {IntechOpen},
address = {Rijeka},
year = {2012},
editor = {John C. Morrison},
chapter = {9},
doi = {10.5772/35190},
url = {https://doi.org/10.5772/35190}
}