Morales E, Garcia-Esteban R, de la Cruz OA, Basterrechea M, Lertxundi A, de Dicastillo MD, Zabaleta C, Sunyer J. Intrauterine and early postnatal exposure to outdoor air pollution and lung function at preschool age. Thorax. 2015 Jan;70(1):64-73. doi: 10.1136/thoraxjnl-2014-205413