link to actual paper: http://jech.bmj.com/content/early/2014/03/03/jech-2013-203500.full.pdf+html?sid=5fecc845-0e21-4e37-9b20-e15d266d525b http://jech.bmj.com/

link to actual paper: http://jech.bmj.com/content/early/2014/03/03/jech-2013-203500.full.pdf+html?sid=5fecc845-0e21-4e37-9b20-e15d266d525b http://jech.bmj.com/content/early/2014/03/03/jech-2013-20350...