RT Journal Article SR Electronic T1 In this issue JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 1 OP 1 VO 61 IS 1 A1 Carlos Alvarez-Dardet A1 John R Ashton YR 2007 UL http://jech.bmj.com/content/61/1/1.abstract AB