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Contributors All authors have contributed to the conception or design of the work, or the acquisition, analysis or interpretation of data; drafted the work or revising it critically for important intellectual content; made final approval of the version published; agreed 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.
Competing interests ML is a member of the expert panel of negative pressure wound therapy of the Paul Hartmann (AG) holding company. He received fees for invited speeches on endoscopic vacuum therapy.
Patient consent Obtained.
Ethics approval Ethical Committee of the University of Muenster, Germany.
Provenance and peer review Not commissioned; externally peer reviewed.