“…After eliminating duplicates and screening titles and abstracts, 39 were assessed for eligibility. Of these 39 studies, 29 were excluded [3, 4, 8–10, 14, 16, 17, 19, 21, 26, 28, 30–35, 38, 40–42, 46–48, 54, 55, 58, 59]. Ten studies were included in final qualitative synthesis and, finally, six of which [2, 18, 20, 24, 25, 52] were not taken into consideration because the databases were not available.…”