“…Supplementary Table S1 details the included studies, which were descriptive or observational in design. The most common country of origin was the United States [ 29 – 31 , 35 – 37 , 39 , 40 , 43 , 46 , 47 , 50 , 59 , 62 , 67 ], then France [ 27 , 32 , 33 , 38 , 41 , 42 , 44 , 45 , 52 , 56 , 60 ], with further contributions from Wales [ 63 , 65 , 66 ] and Denmark [ 34 , 48 , 49 , 64 ].…”