3.1.1. Country of Investigation

The majority of these studies were conducted in the USA (*n*=10, 25.6% of the included publications). Others were conducted in Sweden (*n* = 5, 12.8%), France, Canada (*n* = 4, 10.3% for each), the UK (*n* = 3,

7.7%), Spain, Brazil (*n* = 2, 5.1% for each), Norway, Australia, Israel, Korea, Switzerland, Greece, Iran, Germany and China (*n* = 1, 2.6% for each). One study did not specify the country of recruitment.
