“…The majority of the 53 economic evaluations were carried out in the Netherlands (28%) [ 29 , 30 , 38 , 41 – 43 , 49 , 51 , 54 , 57 , 67 , 71 – 73 , 76 ] and the United Kingdom (26%) [ 28 , 33 , 35 , 36 , 44 , 46 , 47 , 50 , 52 , 60 – 62 , 75 , 78 ]. Five studies derive from Spain [ 27 , 39 , 63 , 64 , 66 ] and four respectively from the United States [ 45 , 48 , 68 , 69 ] and Germany [ 31 , 32 , 37 , 40 ].…”