- Correspondence to Dr K Foster, Public Health England North East, Citygate, Gallowgate, Newcastle upon Tyne NE1 4WH, UK;
- Received July 30, 2015
- Revised January 24, 2016
- Accepted February 10, 2016
- First published March 2, 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.