Panella P, Casas M, Donaire‐Gonzalez D, Garcia‐Esteban R, Robinson O, Valentín A, Gulliver J, Momas I, Nieuwenhuijsen M, Vrijheid M, Sunyer J. Ultrafine particles and black carbon personal exposures in asthmatic and non-asthmatic children at school age. Indoor Air. 2017 Sep;27(5):891-9. doi: 10.1111/ina.12382