- Correspondence to Dr Jeremy Keenan, Francis I. Proctor Foundation, University of California 513 Parnassus Avenue, Med Sci S334B, San Francisco, CA 94143, USA;
- Received February 2, 2016
- Revised April 8, 2016
- Accepted April 8, 2016
- First published April 29, 2016.
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.