- Correspondence to: Dr S Loue Case Western Reserve University, School of Medicine, Department of Epidemiology and Biostatistics, 10900 Euclid Avenue, Cleveland, Ohio 44106-4945, USA;
- Accepted February 8, 2005
- First published May 12, 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.