PT - JOURNAL ARTICLE AU - Ridde, Valéry TI - User fees and worst off: it’s time to find a solution DP - 2006 May 01 TA - Journal of Epidemiology and Community Health PG - 398--398 VI - 60 IP - 5 4099 - http://jech.bmj.com/content/60/5/398.short 4100 - http://jech.bmj.com/content/60/5/398.full SO - J Epidemiol Community Health2006 May 01; 60