Received: 3 April 2020
Accepted: 25 May 2020
First Online: 3 June 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Ethical Review Board of Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany (approval number 8425_BO_K_2019). Moreover, the protocol for this research project conforms to the provisions of the Declaration of Helsinki in 1995 (as revised in Edinburgh 2000). The patient anonymity has been preserved.
: Not applicable.
: The authors declare that they have no competing interests.