Updates are available Correction dated 2021-05-21

Article History

Received: 10 March 2017

Accepted: 28 July 2017

First Online: 24 August 2017

Change Date: 21 May 2021

Change Type: Correction

Change Details: A Correction to this paper has been published:

Change Details: https://doi.org/10.1186/s40168-021-01094-x

Ethics approval and consent to participate

: This study was approved by the Regional Committee for Medical and Health Research Ethics for Central Norway (ref: 120-2000 and 2014/1796/REK midt) and the Norwegian Data Inspectorate (ref: 2003/953-3 KBE/-). At least one of each child’s parent was informed and signed an informed consent form.

: Not applicable.

: The authors declare that they have no competing interests.

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