Funding for this research was provided by:
Rijksinstituut voor Volksgezondheid en Milieu (133)
Received: 22 November 2018
Accepted: 29 May 2019
First Online: 13 June 2019
Ethics approval and consent to participate
: According to Dutch law (Wet medisch wetenschappelijk onderzoek met mensen), formal approval (e.g., from a medical ethics committee) and consent to participate was not required as this study relied on secondary anonymized data collection in the context of performing statutory tasks.
: Consent for publication is not applicable, as this study was based on secondary anonymized data.
: The authors declare that they have no competing interests.