Footnotes

• Contributors All authors provided substantial contributions to the conception or design of the work; the acquisition, analysis or interpretation of data for the work; and drafting the work or revising it critically for important intellectual content. All authors finally approved this version to be published, and all agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. In addition to being accountable for the parts of the work, all authors are able to identify which co-authors are responsible for specific parts of the work. In addition, all authors have confidence in the integrity of the contributions of their co-authors.

• Competing interests None declared.

• Patient consent Detail has been removed from this case description/these case descriptions to ensure anonymity. The editors and reviewers have seen the detailed information available and are satisfied that the information backs up the case the authors are making.

• Ethics approval Ethics Committee University Medical Center Utrecht.

• Provenance and peer review Not commissioned; externally peer reviewed.