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Additional Information

Competing Interests

Jim van Os is an Academic Editor for PeerJ.

Author Contributions

Suzanne Roggeveen conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Jim van Os wrote the paper, reviewed drafts of the paper.

Johan Gielissen conceived and designed the experiments, contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Ron Mengelers conceived and designed the experiments, contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Klaus Golombeck conceived and designed the experiments, contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Richel Lousberg conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Human Ethics

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

1. Medical Ethical Committee Maastricht University Hospital / University of Maastricht

2. NL44004.068.13 / METC 13-3-021

Funding

This study is funded by Maastricht University, Maastricht, The Netherlands. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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