- Correspondence to Dr Sandrah P Eckel, Department of Preventive Medicine, University of Southern California, 2001 N. Soto Street, MC-9234, Los Angeles, CA 90089, USA;
- Received October 12, 2015
- Revised May 2, 2016
- Accepted May 19, 2016
- First published August 4, 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.