Received: 12 August 2019
Accepted: 16 December 2019
First Online: 2 March 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Medical Faculty of the Ruhr-University Bochum under registration number 14-5154-BR. All students provided written informed consent before participation.
: Not applicable.
: The authors declare that they have no competing interests.