Corrigendum

In Vol. 84, issue number 7, 2006, pages 562 and 563, the published titles of Fig. 1 and Fig. 2 were interchanged and the title of Fig. 1 contained an error. The title of Fig. 1 should be “Eligibility of underreporting studies for inclusion in the systematic review” and the title of Fig. 2 should be “Eligibility of epidemiologic studies for inclusion in the systematic review”.