- Correspondence to Dr Pär Hedberg, Department of Clinical Physiology, Västmanland County Hospital, Västerås SE-72 189, Sweden;
- Received June 29, 2016
- Revised October 8, 2016
- Accepted October 18, 2016
- First published November 9, 2016.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.