“…The studies were conducted around the world, including the USA (n = 7), [ 46 , 47 , 48 , 49 , 50 , 51 , 52 ] the UK (n = 1) [ 53 ], Australia (n = 1) [ 54 ], the Netherlands (n = 3) [ 55 , 56 , 57 ], and Canada (n = 1) [ 58 ]. Public health topics addressed in the studies included vaccination rates [ 46 , 47 ], smoking cessation [ 54 ], medication adherence [ 48 , 49 , 52 , 53 , 55 , 57 , 58 ], medication counseling [ 56 ], and hypertension management [ 50 , 51 ]. The majority of the studies used telephones as their intervention tool [ 46 , 47 , 48 , 49 , 52 , 53 , 56 , 57 , 58 ] while only one study used an mHealth app [ 55 ], two studies used a tele-monitoring device [ 50 , 51 ] and one study used photo-aging software [ 54 ].…”