- Correspondence to Dr Nuan Ping Cheah, Cigarette Testing Laboratory, Applied Sciences Group, Health Sciences Authority, 11 Outram Road, Singapore 169078, Singapore;
- Received February 19, 2012
- Revised October 15, 2012
- Accepted October 30, 2012
- First published December 1, 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.