Table 1.

Study population.

	Number of subjects
Subjects enrolled at baseline	766
Subjects not returned to 2nd visit (after 90 days)	31
Subjects examined at baseline and after 90 days	735
- male	380 (51.7%)
- female	355 (48.3%)
- mean age (±SD), years	30.5 (10.3)
- age range, years	18–66