Table 1.

Patients demographics.

Total number of patients	44
Gender	16 (male)	28 (female)
Age
Mean = 35.43	Mean = 29.1	Mean = 39
Range = 20–80	Range = 20–52	Range = 20–80
Etiological factors
Neurologic
N = 11 (25%)	N = 4	N = 7
Structural
N = 12 (27.3%)	N = 2	N = 10
Functional
N = 21 (47.7%)	N = 10	N = 11