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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

John Roger Andersen conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Gerd Karin Natvig conceived and designed the experiments, wrote the paper, reviewed drafts of the paper.

Kristin Haraldstad conceived and designed the experiments, wrote the paper, reviewed drafts of the paper.

Turid Skrede conceived and designed the experiments, performed the experiments, wrote the paper, reviewed drafts of the paper.

Eivind Aadland conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, reviewed drafts of the paper.

Geir Kåre Resaland conceived and designed the experiments, performed the experiments, wrote the paper, reviewed drafts of the paper.

Human Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

Written informed consent for publication of their clinical details was obtained from the parents/guardians/relatives. The study was approved by the regional ethical research committee (2012/1089).

Funding

The study received a grant from the Research Council of Norway (221047/F40). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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