Table 3 Assessment of quality of studies

Author

Year

1

2

3

4

5

6

7

Score

Kon

2007

*

*

*

*

**

*

-

*******

Zhao

2008

-

*

*

**

*

*

-

******

Reicher

2007

*

*

*

**

**

*

-

********

Vassiliades

2009

*

*

*

**

*

*

*

********

Delhaye

2010

*

*

*

**

*

*

-

*******

Hu

2010

*

*

*

**

**

*

*

*********

Halkos

2011

*

*

*

*

*

*

-

******

Bachinsky

2012

-

*

*

**

**

*

-

*******

Leacche

2012

-

*

*

**

*

*

-

******