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Date of initial receipt of a GAD-related medication was designated the "index date".
Date of initial receipt of chemotherapy was designated the "index date".
The date of initial receipt of chemotherapy was designated the "index date".
We examined healthcare utilization and costs over the 12-month periods preceding and following date of initial receipt of such therapy ("pretreatment" and "follow-up", respectively).
Thus, for example, if a patient's date of initial receipt of an SSRI was January 1 and 28 days of such therapy were dispensed, the last day of treatment was assumed to have been January 28 unless there was another pharmacy claim for the same agent on or before February 26 (i.e., 28 days subsequent to January 28).
Similar(55)
Finally, the Canadian Cardiac Rehabilitation Registry collects data from participating CR programs regarding the date of referral, date of referral receipt, date of initial visit and date of program start.
Survival period was determined from the date of initial surgery.
Date of initial diagnosis was identified from medical records.
Follow-up time was calculated using date of initial diagnosis and date of death.
We assume that date of first collection approximates date of introduction rather than date of initial spread.
Date of initial registration is December 13 , 2010
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