Urban air pollution and emergency admissions for asthma in four European cities: the APHEA Project.
Sunyer J, Spix C, Quénel P, Ponce-de-León A, Pönka A, Barumandzadeh T, Touloumi G, Bacharova L, Wojtyniak B, Vonk J, Bisanti L, Schwartz J, Katsouyanni K.
Thorax. 1997 Sep;52(9):760-5.PMID: 9371204 [PubMed - indexed for MEDLINE]Related articlesFree article