“…Of the 33 studies, 6 (18%) involved individuals with lived experience [ 14 , 58 , 62 , 66 , 68 , 70 ], 23 (70%) involved service users [ 6 , 43 - 45 , 47 - 50 , 52 - 55 , 57 , 59 - 61 , 63 - 65 , 67 , 69 , 72 , 73 ], and 4 (12%) involved both [ 46 , 51 , 56 , 71 ]. A total of 18 (55%) studies of the 33 studies included adult participants [ 43 - 47 , 49 - 51 , 54 , 55 , 58 , 60 - 65 , 71 , 72 ], 6 (18%) studies described their participants as young people [ 6 , 52 , 53 , 56 , 59 , 70 ], 3 (9%) studies described their participants as adolescents [ 45 , 68 , 73 ], and 6 (18%) did not specify the age group of their participants [ 14 , 48 , 57 , 66 , 67 , 69 ].…”