Funding for this research was provided by:
Research pool of the Carl von Ossietzky University Oldenburg
Received: 19 March 2020
Accepted: 8 December 2020
First Online: 17 December 2020
Ethics approval and consent to participate
: The German part of the study was approved by the Medical Ethics Committee of the Carl von Ossietzky University Oldenburg (No. 041/2016), which was in line with local law. For the Dutch part, no ethical approval was required, as participants were healthy volunteers and no patients, it was a one-time questionnaire, and the questions were not intrusive. Before answering the questionnaire, the participants were informed that their privacy would be respected. Data were anonymized before data handling.
: Not applicable.
: MHF receives personal fees from DAK Gesundheit, unrelated to the submitted work. The authors report no other conflicts of interest in this work.