“…Twenty studies were controlled studies [ 25 – 27 , 29 , 32 , 34 , 36 – 44 , 46 , 48 , 49 , 51 , 52 ], two of which were RCTs [ 44 , 51 ]. The other eight studies were before/after surveys, without a control group [ 28 , 30 , 31 , 33 , 35 , 45 , 47 , 50 ]. The target populations were staff working in hospitals and nursing homes, including nurses [ 35 , 37 – 39 , 41 – 43 , 45 , 47 – 49 , 51 ], surgeons (3 studies) [ 27 , 44 , 46 ], medical students (4 studies) [ 25 , 32 , 36 , 52 ] and other health care workers (8 studies) [ 26 , 28 – 30 , 33 – 34 , 40 , 50 ].…”