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During the peer review process of this manuscript, it came to our attention that one of the reviewers, Erling Solheim, may have an undeclared conflict of interest. We were told that he had worked in the same research group as the authors from June 2006 to September 2007 and had published research with the authors in 2008 and 2013.
We attempted to contact Erling Solheim a number of times to verify these claims, but he has not responded to our emails. If true, we do not feel that this undeclared conflict of interest would have compromised the peer review process or altered our decision to publish the manuscript.