Systematic sampling is straightforward and low risk, offering better control. However, it may introduce sampling errors and ...

Meaningful child participation in medical research is seen as important. In order to facilitate further development of participatory research, we performed a systematic literature study to describe ...

Observational Methods The emergence of comparative effectiveness has led to a renewed interest in the role of observational studies for assessing the benefits and harms of alternative interventions.

Through direct observation of people, marketing specialists are able to identify actions and watch how subjects respond to various stimuli. For a small business, observational marketing research is ...

Background: It is unclear whether the use of selective serotonin reuptake inhibitors (SSRIs) and other antidepressant drugs reduce the risk of suicide in people with depression. We explored the ...