Retraction Retraction dated 2020-11-30

Article History

Received: 24 October 2019

Accepted: 12 April 2020

First Online: 21 April 2020

Change Date: 30 November 2020

Change Type: Correction

Change Details: This article has been retracted. Please see the Retraction Notice for more detail: https://0-doi-org.brum.beds.ac.uk/10.1186/s12874-020-01166-w.

Ethics approval and consent to participate

: All participants volunteered and received a data protection declaration in agreement with the Helsinki Declaration. They gave both, written and verbal, informed consent. The study was approved according to the ethical guidelines by the Ethical commission of the Medical Faculty of the Technische Universität Dresden (EK 79032011).

: Not applicable.

: The authors declare that they have no competing interests.