- Correspondence to Dr Kevin L Winthrop, Oregon Health and Sciences University, 3375 SW Terwilliger Dr., Portland, OR 97239, USA;
- Received July 10, 2012
- Accepted August 7, 2012
- First published September 12, 2012.
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.