Impact of atmospheric nitrogen dioxide on emergency department visits for asthma in a low air pollution area: A time series and case-crossover study

1. Albi, T.R.
2. López-Izquierdo, R.
3. Cerezo-Hernández, A.
4. Moreno, F.
5. Díez, P.B.
6. Álvarez, D.
7. Del Campo, F.