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Declaration of Helsinki

Regarding the ethical issues in research, this Declaration was first adopted by the World Medical Association in 1964 at Helsinki to guide the biomedical researchers working with human participants. There were some modifications to the Declaration of Helsinki and the final revision was made in 2000 in Scotland. During 2002 and 2004, two clauses were added to two principles in this declaration. This declaration includes 32 articles in 3 sections. The following part explains some of the principals mentioned in the Declaration of Helsinki. 

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Observational studies

The main aim of these studies is not only to describe and express the status of the present situation, but also to identify and compare the relationships between two or more variables and their impact in different groups.

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