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Authors
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Funding
Funding for this research was provided by:
German Federal Ministry of Family Affairs, Senior Citizens, Women, and Youth
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Article History
Received: 25 August 2016
Revised: 20 June 2017
Accepted: 14 July 2017
First Online: 12 January 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: The study has been approved by the Internal Review Board of the University of Bonn. Informed consent was obtained from all individual participants included in the study.
