Berentzen, N E
van Stokkom, V L
Gehring, U
Koppelman, G H
Schaap, L A
Smit, H A
Wijga, A H
Article History
Received: 15 April 2014
Revised: 13 June 2014
Accepted: 4 July 2014
First Online: 13 August 2014
Competing interests
: GHK has received grants from the Dutch Lung Foundation, Biobanking and Biomolecular Resources Research Infrastructure and Stichting Astma Bestrijding. These organizations or study sponsors were not involved in the design or conduct of the current study. The remaining authors declare no conflict of interest.