Funding for this research was provided by:
Innovation Fund coordinated by the Innovation Committee of the Federal Joint Committee in Germany (01VSF16055)
Text and Data Mining valid from 2020-02-11
Received: 25 July 2019
Accepted: 5 February 2020
First Online: 11 February 2020
Ethics approval and consent to participate
: For both cross-sectional studies the need for ethics approval was waived. Since data in both surveys were collected anonymously consent to participate was not required. These waivers were approved by the medical ethics committee of the Carl von Ossietzky University of Oldenburg in Germany (2018–080 and 2018–147). Since data was collected anonymously consent to participate was not required.
: Not applicable.
: The authors declare that they have no competing interests.