The search identified 6376 citations, of which 231 studies were initially assessed for eligibility, and out of which 188 were deemed ineligible and removed for various reasons (Fig. 1). Nine records were identified using backwards and forwards chaining of reference lists. Forty-three met the eligibility criteria and were included for full-text analysis in this study [26], [27], [28], [29], [30], [31], [32], [33], [34], [35], [36], [37], [38], [39], [40], [41], [42], [43], [44], [45], [46], [47]