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Authors
Joelson, Anders
Danielson, Barbro I.
Hedlund, Rune
Wretenberg, Per
Frennered, Karin
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Article History
Received: 2 July 2019
Accepted: 29 December 2019
First Online: 17 February 2020
Compliance with ethical standards
:
: The authors declare that there is no conflict of interests.
: The study was approved by the regional ethical review board in Gothenburg, Registration Number 640-08 and T975-15.
