Received: 28 September 2019
Accepted: 6 March 2020
First Online: 16 March 2020
Ethics approval and consent to participate
: According to the guidelines for online surveys of market and social research associations in Germany, formal ethical approval was not required. This guideline states that the scientific approach of the survey, the informed consent to participate, the anonymization of the participants and the strict separation of scientific from nonscientific activities have to be granted [CitationRef removed]. <i>GapFish</i> guarantees that all requirements are fulfilled. Participants have long-term agreements with <i>GapFish</i> and have given written consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.