**Data Extraction**:
- Study characteristics of the papers that are included in the final analysis can be found in https://osf.io/s69z3/ (and in Table 1 of the manuscript)
- Data from 3 studies was extracted with Plot Digitizer (http://plotdigitizer.sourceforge.net/).
- Ganzendam: https://osf.io/7xr36/
- Baumann: https://osf.io/jfqy2/
- Torrents-Rodas: https://osf.io/epsuy/
- For two papers, correlations were calculated:
- Garcia: https://osf.io/dhkuf/
- Davey: https://osf.io/gqwmk/
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**Analysis**:
Final analysis performed with CMA software by MK on July 5th 2019. Availabe on OSF:
- Datasets
- CMA format: https://osf.io/xgt3r/
- excel format: https://osf.io/82dxb/
- CMA output
- Fail-safe-N: https://osf.io/8qmua/
- Duval and Tweedie: https://osf.io/6dpwe/
- Egger: https://osf.io/4a2mu/
- Kandal: https://osf.io/wutrf/
- Forestplot: https://osf.io/tngmf/
- Funnelplot: https://osf.io/5uhmv/
- Results: https://osf.io/r2945/
