“…In terms of the specific health topic of interest, 22/58 papers included any health condition [ 7 , 15 , 16 , 21 , 30 , 32 , 34 , 36 , 37 , 39 , 44 , 45 , 47 , 52 , 54 , 55 , 62 , 65 , 69 , 72 – 74 ]. Twelve focused on mental health conditions [ 20 , 23 , 24 , 28 , 42 , 48 , 50 , 53 , 58 , 64 , 66 , 71 ], 9 on adverse drug reactions (ADRs) [ 31 , 43 , 46 , 51 , 57 , 67 , 68 , 70 , 75 ], 4 on infectious diseases [ 25 , 29 , 40 , 41 ], two each on chronic disease [ 26 , 56 ], substance misuse [ 49 , 60 ], public health [ 27 , 59 ], breast cancer [ 33 , 38 ] and with one each for symptom identification [ 35 ], use of complementary and alternative medicine (CAM) therapies [ 61 ] and the reasons for existing use by health researchers [ 63 ].…”