“…All studies were published after 1993 and, except for six, ( 13 , 20 , 22 , 25 , 31 , 32 ) the majority were published after 2000. Ten of the selected studies were from the United States, ( 22 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ) 18 from the European countries, ( 7 , 17 , 21 , 40 , 41 , 42 , 43 – 45 , 46 , 47 – 50 , 51 , 52 , 53 , 54 ) two each from Japan, ( 55 , 56 ) United Kingdom, ( 13 , 25 ) Turkey, ( 57 , 58 ) and Canada. ( 20 , 59 ) There was one intervention each from Taiwan, ( 60 ) Norway, ( 61 ) and Brazil.…”