@article{Håberg2007,
author = {Håberg, S.E. and Stigum, H. and Nystad, W. and Nafstad, P.},
title= {Effects of pre-and postnatal exposure to parental smoking on early childhood respiratory health},
year = {2007},
doi = {10.1093/aje/kwm134},
volume = {166},
number = {6},
pages = {679--686},
}