CONTINENT

COUNTRIES

STUDIES

N˚

Total

Africa

Democratic Republic of Congo

Laffite et al., 2016 [8]

1

1

North America

Canada

Gromala; Neufeld; Mcconkey, 2021 [9]

1

9

USA

Williams et al., 2018 [10] , Choi; Dunams; Jiang, 2010 [11] , Chu et al., 2018 [12] , Skwor et al., 2020 [13] , Harmon et al., 2019 [14] , Londono et al., 2019 [15] , Bared et al., 2013 [16]

7

Mexico

Brito et al., 2015 [17]

1

South America

Brazil

Carvalho et al., 2007 [18] , Conte et al., 2021 [19] , Regina et al., 2021 [20] , Purificação et al., 2017 [21]

4

6

Colombia

Perlaza et al., 2019 [22]

1

Chile

Leon et al., 2012 [23]

1

Asia

China

Chen et al., 2019 [24] , Li et al., 2019 [25] , Liang et al., 2020 [26] , Liao et al., 2018 [27] , Niu et al., 2019 [28] , Xiao et al., 2013 [29] , Xie et al., 2021 [30] , Zhang et al., 2020 [31]

8

9

Japan

Miyagi et al., 2019 [32]

1

Europe

Spain

Piedra et al., 2017 [33]

1

6

France

Devarajan et al., 2015 [34] ,

Girlich, Poirel, Nordmann, 2011 [35]

2

Italy

Adelowo; Akinlabi; Fagade, 2012 [36]

1

Portugal

Tacao; Correia; Henriques, 2015 [37]

1

Switzerland

Corno et al., 2014 [38]

1