Second, enrollment of patients only during the hours of research assistant availability may have introduced an inclusion bias into our sample.
And sixth, enrollment of the pregnant woman herself allows for repeated and comprehensive collection of pregnancy exposure timing and dose information, including over-the-counter drugs, and information on potential confounding variables such as alcohol and tobacco use.
Follow-up began on 1 January 1978 (or the date of first enrollment if it occurred later).
This was the first enrollment, when Quirinius was governor of Syria.
The first measurement in this study was taken at week 50 counting from the time of the first enrollment.
The group will be in the midst of a campaign to get people signed up for health insurance during the second enrollment period of Obamacare.
The number of new international graduate students coming to study in the United States rose 4.7 percent from 2009 to 2010, while first-time enrollment of domestic students declined 1.2 percent.
First-time enrollment of international students at graduate schools in the United States grew 8 percent from 2010 to 2011, according to a study released last week.
Third, the enrollment of some healthy controls during an immunization visit resulted in oversampling of children shedding vaccine virus.
