Scientific Reports 4, Article number: 5031 (2014); Published: 22 May 2014; Updated: 14 August 2014

There are errors in Figure 2 of this Article. The RR for Karppi, 2012 “0.450 (0.250, 0.950)” should read “0.450 (0.210, 0.950)”. The RR for Overall “0.802 (0.672, 0.958)” should read “0.807 (0.680, 0.957)”. The correct Figure 2 appears below as Figure 1.

figure 1