“…Out of the 14 studies, five (Bergh et al, 1999;Ericson et al, 2002;Pinborg et al, 2003Pinborg et al, , 2004a were partially overlapping, therefore only the two most recent publications, with the larger cohort were included in the meta-analysis (Pinborg et al, 2004b for the Danish data set, Ericson et al, 2002 for the Swedish data set). The metaanalysis was therefore performed on 11 of the 14 data sets (Table 2), which reported pertinent, nonoverlapping, and comparable data.…”