- Correspondence to Professor Jan Ekstrand, Health University, Hertig Karlsgatan 13BS-582 21, Linköping, Sweden;
- Accepted 12 October 2017
- Published online 22 October 2017.
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.