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Additional Information

Competing Interests

The authors declare 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.

Ulrikke J.V. Hernæs conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, reviewed drafts of the paper.

Karl Ove Hufthammer performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Villy Våge conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, reviewed drafts of the paper, dr. Villy Våge started the obesity surgery program at Førde Central Hospital back in 2001, and set up a research data base that made this study possible. As a bariatric surgeon he has also has operated many of the patients included in this study..

Human Ethics

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

Regional Committee for Medical and Health Research Ethics in Western Norway (REK vest, ref. nr. 2013/1747).

Data Deposition

The following information was supplied regarding the deposition of related data:

All relevant data can be downloaded here: http://dx.doi.org/10.5281/zenodo.16272

Funding

This study was funded by grant from Helse Vest RHF (the Western Norway Regional Health Authority). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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