Assertion: placebo's study | /r/HasProperty | a 4-month continuation phase
Facets:
value: as an active comparator
type: MANNER
value: to calibrate the trial's validity
type: PURPOSE
Source sentences:
text: This placebo-controlled study was designed to expand on previous trials by studying outpatients with well-defined major depression of moderate severity and included a 4-month continuation phase and sertraline as an active comparator to calibrate the trial's validity.