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Article History

Received: 8 October 2019

Accepted: 17 March 2020

First Online: 4 June 2020

Ethics approval and consent to participate

: This retrospective study was evaluated by the local ethics committee, Ärztekammer Nordrhein (reference number 2018078) and by Ärztekammer Saarland (196/19), for a prospective follow-up study with identical parameters. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.

: All patients or their legal representative routinely sign a consent form for anonymous internal data analysis and possible publication of their data.

: The authors declare that they have no competing interests.