Fig. 2

Primary and secondary endpoints of the analysed studies. The parameter with the highest incidence is depicted on the left, with the lowest incidence on the right. This figure shows graphically how often parameters were used in the studies analysed. On the x-axis (columns): from P1 to P49 the different parameters analysed (for their definitions see Table 1). On the y-axis (lines): the specific studies (i.e., n = 372). For the percentages of each specific parameters see Table 1