“…For the 42 studies , quality was 'good' in eight [20,21,[24][25][26]36,53,57], 'fair' in 22 [23,27,29,[31][32][33]37,38,40,41,43,47,49,51,52,[54][55][56][58][59][60][61] and 'poor' in 12 studies [22,28,30,34,35,39,42,[44][45][46]48,50]. As studies rated of 'good' quality were deemed to have low bias, we wanted to investigate the prostate cancer prevalence specifically for these studies [20,21,[24][25][26]36,53,57].…”