Characteristics of the 31 studies included in the meta-analysis.

ALIC: Anterior limb of the internal capsule
VC/VS: Anterior limb of the internal capsule–ventral capsule- and ventral striatum
Response defined as a reduction of Y-BOCS scores > 35%
* The authors make reference to four patients with severe OCD treated with DBS but information is provided just for one.
a One patients included in Nuttin et al., 1999 [20]
b Three patients included in Gabriels et al., 2003 [22]
c Patient included in Aouizerate et al., 2004 [27]
d One patient included in Aouizerate et al., 2004 [27]
e Patients included in Guehl et al., 2008 [32]
f Ten patients included in Greenberg et al., 2006 [12] and five patients included in Nuttin et al., 2003 [23]
g Five patients included in Greenberg et al., 2010 [10]
h Patient included in Goodman et al., 2010 [37]
i Three patients included in Mallet et al., 2008 [33]
j Two patients included in Mallet et al., 2008 [33]
k Five patients included in Jimenez-Ponce et al., 2009 [35]
l Information on long term response available for 3 patients
m Individual data not available, results correspond to mean results from the study
n Information available in 8 patients
o Information available in 5 patients
Characteristics of the 31 studies included in the meta-analysis.