- Correspondence to I B O'Farrell, Department of Epidemiology & Public Health, University College Cork, Republic of Ireland;
- Received June 26, 2014
- Revised September 11, 2014
- Accepted September 24, 2014
- First published October 15, 2014.
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.