- Correspondence to Dr Adrian Loerbroks, Institute of Occupational and Social Medicine, Centre for Health and Society, Faculty of Medicine, University of Düsseldorf, Moorenstraβe 5, 40225 Düsseldorf, Germany;
- Received April 11, 2014
- Revised July 7, 2014
- Accepted July 14, 2014
- First published September 22, 2014.
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.