- Correspondence to Dr. Erin Keely O’Brien, Office of Science, Center for Tobacco Products, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA;
- Received June 5, 2018
- Revised August 8, 2018
- Accepted August 9, 2018
- First published August 30, 2018.
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.