@article{Basso1999,
author = {Basso, O. and Olsen, J. and Christensen, K.},
title= {A study of environmental, social and paternal factors in preterm delivery using sibs and half sibs. A population-based study in Denmark},
year = {1999},
doi = {10.1136/jech.53.1.20},
journal = {Journal of Epidemiology and Community Health},
volume = {53},
number = {1},
pages = {20--23},
}