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Article History

Received: 30 August 2018

Accepted: 10 September 2019

First Online: 18 September 2019

Ethics approval and consent to participate

: The Ethics Review Committee of the University Medical Center Freiburg approved the study protocol as well as study procedures and materials (551/17). All potential participants will receive information about the study as well as a consent form and a questionnaire by post. Personal data obtained from the residents’ registration offices of Freiburg and Mannheim will only be used for administration purposes to forward information, consent form and questionnaires. Study participation is voluntary. All study participants have to provide informed consent on a separate form besides the questionnaire. The study follows the principles of personal privacy. Initial personal data, returned consent forms and returned questionnaires will be saved separately without the possibility to interlink these data. Questionnaires will not be personalized by codes, so identification of individuals within the study is not possible. Data collection and analyses will be performed anonymously. It will not be possible to draw conclusions about individual participants from reports and publications.

: Not applicable.

: The authors declare that they have no competing interests.