Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2006 Aug 3;2:25. doi: 10.1186/1746-6148-2-25

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © 2006 McIntyre et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

PMC Copyright notice

Regions in GB used to code the attribute 'region' in Tables 1 & 2. South-west England (SW), south-east England (SE), eastern England (ER), East Midlands (EM), West Midlands (WM), Yorkshire and Humberside (YH), north-west England (NW), north-east England (NE), central and south Scotland (SC(CS)), Scottish Highlands and Islands (SC(HI)), Shetland Isles (SH), North Wales (W(N)) and central and south Wales (W(CS)).