Article History
Received: 10 January 2020
Revised: 12 March 2020
Accepted: 27 March 2020
First Online: 10 April 2020
Change Date: 15 September 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1007/s00417-021-05343-5
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the local ethics committee of the faculty of medicine of the Eberhardt-Karls-University Tuebingen and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Because of the length of the investigation period (2004–2018) current address data of the patients were not available for us. The ethics committee of the faculty of medicine of the Eberhardt-Karls-University Tuebingen expressly permitted to carry out the study without informed consent.