- Correspondence to Dr Gry Wisthus Eveborn, Division of Cardiothoracic and Respiratory Medicine, Department of Heart Disease, University Hospital of Northern Norway, Breivika, Tromsø 9038, Norway;
- Received May 21, 2015
- Revised October 5, 2015
- Accepted October 5, 2015
- First published November 3, 2015.
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