|
Söderqvis et al., 2011, [28] Nordic countries [4]
|
2004–2008
|
Case–control
|
7–19
|
352 cases; 646 controls
|
1.36; (0.92 to 2.02)
|
|
Elliott et al., 2010, [10] UK [5]
|
1999–2001
|
Case–control
|
0–4
|
1397 cases: 5588 controls
|
1.02 (0.88 to 1.20)
|
|
Aydin et al., 2011, [1] 4 contries [20]
|
2004–2008
|
Case–control
|
7–19
|
352 cases and 646 controls
|
1.36 (0.92-2.02) >5 years 1.26 (0.7-2.28)
|
|
Richard et al., 2014, [25] UK [22]
|
2007–2009
|
a pilot study
|
0–24
|
49 cases and 78 controls
|
Response rates were 52 % for cases and 32 % for controls.
|
