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A photograph of the researcher on the invitation letter did not affect the participation rate of a postal survey: a randomized study within a trial (SWAT)

Crossref DOI link: https://doi.org/10.1186/s12874-022-01717-3

Published Online: 2022-09-24

Update policy: https://doi.org/10.1007/springer_crossmark_policy

Authors

Prediger, Barbara

Könsgen, Nadja

Bora, Ana-Mihaela

Schlimbach, Anna

Pieper, Dawid
Funding

Funding for this research was provided by:

Private Universität Witten/Herdecke gGmbH
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Text and Data Mining valid from 2022-09-24

Version of Record valid from 2022-09-24
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Article History

Received: 19 April 2022

Accepted: 24 August 2022

First Online: 24 September 2022

Declarations

:

: Our survey, including this SWAT, was approved by the ethics committee of Witten/Herdecke University (case number: 162/2019). The participants agreed to participate in the study by voluntarily completing the questionnaire and thereby gave their informed consent. All methods were carried out in accordance with relevant guidelines and regulations.

: Not applicable.

: The authors declare that they have no competing interests.

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