@article{nafstad_jaakkola_hagen_botten_kongerud_1996, title={Breastfeeding, maternal smoking and lower respiratory tract infections}, DOI={10.1183/09031936.96.09122623}, number={12}, publisher={European Respiratory Society (ERS)}, author={Nafstad and Jaakkola and Hagen and Botten and Kongerud}, year={1996}, month={Dec} }