“…Six hundred and twenty studies were excluded from further analysis, because they reported OD projects with consumer participation in other areas than Health Care. Th e remaining 25 studies consisted of 20 studies on OD projects with consumer participation in various areas of Health Care [15,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] and fi ve systematic reviews of 135 [16], 131 [17], 38 [37], 5 [38], and 143 [39] studies, re- spectively. Table 1 describes the study characteristics such as number of participants/projects, type of consumer participation, study design, use of a control group, and area of Health Care of these 25 studies.…”