Study | Selection | Comparability | Exposure/Outcome |
---|
Hagan 1995 [40] | ★★★ | ★★ | ★ |
Hagan 2004 [41] | ★★★★ | ★★ | ★★ |
Holtzman 2009 [42] | ★★★★ | ★★ | ★ |
Patrick 2001 [43] | ★★★★ | ★ | ★★ |
Roy 2007 [44] | ★★★ | ★ | ★ |
Todd 2015 [45] | ★★★★ | ★★ | ★★ |