RT Journal Article SR Electronic T1 User fees and worst off: it’s time to find a solution JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 398 OP 398 VO 60 IS 5 A1 Ridde, Valéry YR 2006 UL http://jech.bmj.com/content/60/5/398.abstract AB