“…Thirteen out of 41 studies declared their conflict of interest according to question number 19 in the checklist [9], [10], [16], [18], [19], [24], [26], [28], [33], [34], [38], [39], [40]. Twelve studies did not receive the ethic committee approval nor the participant consent [6], [8], [14], [19], [21], [24], [25], [26], [33], [37], [38], [41]. The details of the assessment are presented in Table 1.…”