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Authors
Franzon, Bengt
Axtelius, Björn
Åkerman, Sigvard
Klinge, Björn
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Article History
Received: 10 October 2016
Revised: 10 February 2017
Accepted: 27 February 2017
First Online: 5 May 2017
Competing interests
: The authors declare no conflict of interest.
