Funding for this research was provided by:
ZonMw (ZonMW 80-82305-97-12022)
Dutch Lung Foundation (AF 3.4.08.047)
Received: 8 November 2016
Accepted: 4 January 2018
First Online: 31 January 2018
Ethics approval and consent to participate
: The recruitment strategies were approved by the Medical Ethic Committee MUMC+. Questionnaire A was also used to analyse the association between SHS and respiratory complaints in children in another manuscript [CitationRef removed]. Participants proved written consent information.
: Not applicable.
: The authors declare that they have no competing interests.
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