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Article History

Received: 15 November 2018

Accepted: 1 February 2019

First Online: 4 March 2019

Ethics approval and consent to participate

: Retrospective evaluation of the data was in accordance with the ethical standards of the institutional research committee of each site and approved accordingly (ethics committee of the University Hospital Carl Gustav Carus of the Technische Universität Dresden – EK161082004 and EK158082004). Written informed consent was obtained from all individual participants included in the study. Patients were diagnosed and treated according to national guidelines and the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

: Not applicable.

: The authors declare that they have no competing interests.

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