10
12
14
16
18
20
22
24
26
28
Maio et al. 2010
Vignera et al. 2011*
Khoo et al. 2013*
Lamina et al. 2009
Maresca et al. 2013
Kalka et al. 2013*
Baseline|
Outcome|
* Indicates scaled values
 f 
in