There are some studies for which written informed consent from participants is not required.

Name: There are some studies for which written informed consent from participants is not required.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

In some cases, such as when using existing data or conducting certain types of observational research, written informed consent may not be required. However, ethical guidelines should still be followed and participants should be informed about the study and have the opportunity to opt out if desired.

There Are Some Studies for Which Written Informed Consent from Participants