- Correspondence to:
Department of Medicine, Clinical Epidemiology Unit M9:01, Karolinska University Hospital Solna, SE-171 77, Stockholm, Sweden;
- Accepted January 9, 2006
- First published January 13, 2006.
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.