Author

Year of publication

Total

N

(%)

2001 & 2002

N (%)

2003 & 2004

N (%)

2005 & 2006

N (%)

2007 & 2008

N (%)

2009 & 2010

N (%)

2011 & 2012

N (%)

2013 & 2014

N (%)

Sole author

3

(30.0)

9

(47.4)

9

(34.6)

11

(30.6)

9

(26.5)

8

(22.9)

7

(21.9)

56

(29.2)

2 authors

4

(40.0)

9

(47.4)

13

(50.0)

16

(44.4)

13

(38.2)

16

(45.7)

13

(40.6)

84

(43.7)

3 authors

3

(30.0)

1

(5.2)

3

(11.5)

6

(16.7)

7

(20.5)

9

(25.7)

8

(25.0)

37

(19.3)

≥4 authors

-

-

1

(3.9)

3

(8.3)

5

(8.8)

2

(5.7)

4

(12.5)

15

(7.8)

Total

10

(100)

19

(100)

26

(100)

36

(100)

34

(100)

35

(100)

32

(100)

192

(100)