Contributors
BMF, GOR, ETBM and GNV performed the literature research, designed the data extraction form, and performed the data extraction and data analysis. IGD, IFK, EMD critically reviewed the analyzed the data. BMF wrote the paper. IGD, IFK, EMD critically reviewed subsequent drafts. All authors approved the final version of the manuscript for submission. All authors had full access to all of the data in the study and took responsibility for the integrity of the data and the accuracy of the data analysis.