“…Most (20/32) of the included studies were conducted in North America [ 21 – 24 , 26 – 30 , 32 , 36 , 37 , 43 , 45 – 51 ], with 9 conducted in Europe [ 20 , 31 , 34 , 35 , 38 , 39 , 41 , 42 , 44 ] and 3 in Asia [ 25 , 33 , 40 ]. The median sample size for the intervention group was 202 (range: 15–29,042) and the median study duration was 12.0 months (range: 3 months–2 years).…”