“…No article was excluded after quality evaluation according to MMAT guidelines, because it might have caused bias [ 22 ]. Two papers were scored as low [ 23 , 24 ], four papers as moderate [ 25 , 26 , 27 , 28 ], and thirteen as very high [ 10 , 12 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. Two papers with low scores were retained because despite having participants from limited areas, they investigated important ideas related to this systematic review.…”