- Correspondence to Professor Per Gustavsson, Unit of Occupational Medicine, Institute of Environmental Medicine, Karolinska Institutet, Norrbacka, Level 4, SE-171 76 Stockholm, Sweden;
- Accepted April 29, 2011
- First published June 24, 2011.
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.