Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. Meta-analysis: This type of study involves using statistics to combine the data from multiple previous studies to ...

Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. Randomised controlled trial: Subjects are randomly assigned to a test group, which receives the treatment, or a ...

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Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. Observational study: A study in which the subject is observed to see if there is a relationship between two or ...

Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. Observational study: A study in which the subject is observed to see if there is a relationship between two or ...

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Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. New genetics support the theory that iguanas voyaged to Fiji on ocean debris, in what scientists claim is the ...

Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. University of Queensland scientists have helped to construct a detailed timeline for bacterial evolution, ...

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Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. Experimental study: At least one thing in the experiment was changed to see if it had an impact on the subjects ...

Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. Systematic review: This type of study is a structured approach to reviewing all the evidence to answer a specific ...

Not peer-reviewed: This work has not been scrutinised by independent experts, or the story does not contain research data to review (for example an opinion piece). If you are reporting on research ...