“…Twenty-three studies used a promotion strategy [ 17 , 19 , 20 , 21 , 22 , 24 , 25 , 26 , 27 , 28 , 30 , 31 , 32 , 34 , 36 , 37 , 38 , 39 , 41 , 42 , 43 , 44 , 45 ] as the sole intervention approach. Ten promotion interventions had positive effects [ 34 , 36 , 37 , 38 , 39 , 41 , 42 , 43 , 44 , 45 ], four reported mixed effects (positive + null) [ 17 , 19 , 20 , 21 ], six reported mixed effects (positive + null + negative) [ 22 , 24 , 25 , 26 , 27 , 28 ], two reported null effects [ 31 , 32 ], and one reported negative effects [ 30 ].…”