Table 3
Distribution of Studies According to Years and the Countries of First Authors
Country
2011
2012
2013
2014
2015
Total
USA
25
31
52
29
12
149
Taiwan
5
11
12
9
9
46
Australia
4
9
10
14
7
44
Great Britain
2
12
6
9
6
35
Spain
4
7
8
10
5
34
Turkey
4
5
10
3
5
27
China
2
4
1
6
8
21
Canada
6
3
5
6
1
21
Malaysia
3
4
2
2
3
14
Greece
6
1
3
1
2
13
South Africa
1
1
1
4
4
11
South Korea
0
1
2
2
5
10
Other
27
17
24
20
31
102
Total
89
106
136
115
98
544
Country
2011
2012
2013
2014
2015
Total
USA
25
31
52
29
12
149
Taiwan
5
11
12
9
9
46
Australia
4
9
10
14
7
44
Great Britain
2
12
6
9
6
35
Spain
4
7
8
10
5
34
Turkey
4
5
10
3
5
27
China
2
4
1
6
8
21
Canada
6
3
5
6
1
21
Malaysia
3
4
2
2
3
14
Greece
6
1
3
1
2
13
South Africa
1
1
1
4
4
11
South Korea
0
1
2
2
5
10
Other
27
17
24
20
31
102
Total
89
106
136
115
98
544
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