Association between traffic-related air pollution and asthma in preschool children in a national Japanese nested case-control study

Hasunuma H, Sato T, Iwata T, Kohno Y, Nitta H, Odajima H, Ohara T, Omori T, Ono M, Yamazaki S, Shima M. Association between traffic-related air pollution and asthma in preschool children in a national Japanese nested case-control study. BMJ Open. 2016; 6(2): e010410.