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Authors
Springer, Jochen https://orcid.org/0000-0001-5831-4748
Anker, Stefan D.
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Article History
Received: 8 October 2016
Accepted: 26 October 2016
First Online: 24 November 2016
Conflict of interest
: J. Springer and S.D. Anker declare that they have no competing interests.
Free to read: This content has been made available to all.
