Received: 23 March 2020
Accepted: 24 September 2020
First Online: 6 October 2020
Ethics approval and consent to participate
: The study protocol was approved by the local ethics committee. The institutional review board also approved the study (ethics approval registration number: EK 19/14; issue date: 16 June 2014). The study was also registered in the German Clinical Trials Register (clinical trial registration number: DRKS00017076). We conducted the study in accordance with the study protocol, the latest Helsinki Declaration, and good clinical practice guidelines. Informed consent was written obtained from all individual participants included in the study.
: Not applicable (no identifying personal information is included in this article).
: The authors declare that they have no competing interests.