Sentence examples for both control studies were from inspiring English sources

The protocols for both control studies were approved by the Institutional Ethical Board.

Case control studies were excluded.

Another drawback of case control studies is that the exposure measure (cannabis use) has to be assessed retrospectively.

10 Both cohort and case-control studies were included in this review.

Both of these case-control studies were conducted on the same population of children with the cases (N= 88) previously identified as having asthma prior to the onset of the study with the goal to determine if formaldehyde exposures in their homes might have been responsible.

For case-control studies, were cases and controls recruited from the same population?

For case-control studies, were cases and controls recruited over the same period of time?

No case-control studies were identified.

Only case-control studies were considered.

Six published case-control studies were collected.

Two independent case-control studies were performed.