Supplement 1. An ASCII text file listing the studies included in the meta-analysis including treatment and reference means, SDs, and calculated effect sizes.

File List studies.txt Description The file studies.txt contains all data extracted from published sources and used in this meta-analysis. Means in buffers and reference sites, together with standard deviations are presented together with the calculated effect sizes. This table also presents the complete listing of published studies used in the meta-analysis.