- Correspondence to Professor Jan Ekstrand, Division of Community Medicine, Department of Medical and Health Sciences, Linköping University, Hertig Karlsgatan 13B, Linköping S-582 21, Sweden;
- Accepted December 11, 2015
- First published January 8, 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.