title: Comorbidities of asthma during childhood: possibly important, yet poorly studied.
authors.affiliation: Princess Amalia Children's Clinic, Isala Klinieken, 8000 GK, Zwolle, The Netherlands. e.p.de.groot@isala.nl
authors.forename: E P
authors.initials: EP
authors.lastname: de Groot
authors.forename: E J
authors.initials: EJ
authors.lastname: Duiverman
authors.forename: P L P
authors.initials: PL
authors.lastname: Brand