- Correspondence to Dr Dan Norbäck, Department of Medical Science, Uppsala University and Occupational and Environmental Medicine, University Hospital, SE-751 85 Uppsala, Sweden;
- Received June 3, 2012
- Revised November 20, 2012
- Accepted January 9, 2013
- First published February 8, 2013.
This web only file has been produced by the BMJ Publishing Group from an electronic file supplied by the author(s) and has not been edited for content.
Files in this Data Supplement:
- Data supplement 1 - Online supplement
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.