“…Fourteen studies were from the USA,[ 14 – 18 , 20 – 24 , 34 – 37 ] 5 were from the Netherlands, [ 30 , 32 , 33 , 41 , 42 ] 5 were from Switzerland,[ 13 , 27 – 29 , 31 ] 4 were from Germany,[ 13 , 26 , 38 , 39 ] and 4 other studies were from Spain,[ 19 ] United Kingdom,[ 13 ] Canada,[ 25 ] and Australia,[ 40 ] respectively. One study on a self-administered questionnaire was conducted in three European countries—Germany, United Kingdom, and Switzerland.…”