“…The study flow is depicted in Figure 2 and the included studies are in Table 1 [6,7,11,12,13,14,15,16,17,18,19]. We retrieved 135 reports from electronic databases and included 7 reports from 6 studies [6,7,11,15,16,17,19]. We additionally retrieved 4 papers through hand search [12,13,14,18], 3 of which were not included in electronic databases [12,13,18].…”